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  • 51.
    Jaskorzynska, Bozena
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Kista Photonics Research Center, KPRC.
    Zawistowski, Jacek
    Polish Academy of Sciences, Poland .
    Dainese, Matteo
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Kista Photonics Research Center, KPRC.
    Cardin, Julien
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Kista Photonics Research Center, KPRC.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Kista Photonics Research Center, KPRC.
    Widely tunable directional coupler filters with 1D photonic crystal2005Inngår i: 2005 7th International Conference on Transparent Optical Networks, Vol 1, Proceedings, IEEE , 2005, s. 136-139Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We present two concept examples for adding a wide range tunability to Si/SiO2 devices involving a photonic crystal element. They are based on a directional coupler filter of two different geometries, where one of the arms is a Bragg Reflection Waveguide (BRW) used for the bandwidth improvement. The tuning relies on changing the properties of the BRW core. As an illustration we consider the smectic A* liquid crystal as the core material and show that ca 100 nm tuning range is achievable by the core index variations of 0.006 under applying electric field of 5 V/mu m.

  • 52. Johansson, M.
    et al.
    Lofving, B.
    Hard, S.
    Thylén, Lars
    KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
    Mokhtari, M.
    Westergren, Urban
    KTH, Tidigare Institutioner                               , Elektronik.
    Pala, C.
    Study of an ultrafast analog-to-digital conversion scheme based on diffractive optics2000Inngår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 39, nr 17, s. 2881-2887Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A potentially ultrafast optical analog-to-digital (A/D) converter scheme is proposed and was partly studied experimentally. In the A/D converter scheme the input signal controls the wavelength of a diode laser, whose output beam is incident on a grating. The beam from the grating hits a diffractive optical element in an array. The wavelength determines which element is illuminated. Each element fans out a unique spot-pattern bit code to be read out in parallel by individual detectors. In the experiment all patterns but one from 64 array elements were read out correctly.

  • 53.
    Jänes, Peter
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Tidström, Jonas
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Limits on optical pulse compression and delay bandwidth product in electromagnetically induced transparency media2005Inngår i: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 23, nr 11, s. 3893-3899Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Delay bandwidth products (DBPs) and physical pulselengths obtainable in media exhibiting electromagnetically induced transparency (EIT) are analyzed. The study is performed in stationary media as well as for dynamic storing of light pulses in such media. In the latter case; the dispersion inherent in storage and readout of the pulses is analyzed. It is shown that absorption and the group velocity dispersion (GVD) are limiting factors. Analytical expressions for the minimum compressed 'pulselength and DBP are derived, and these expressions show good agreement with simulations of pulse propagation in EIT media.

  • 54. Lewen, R.
    et al.
    Maximov, I.
    Shorubalko, I.
    Samuelson, L.
    Thylén, Lars
    KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
    Xu, H. Q.
    High frequency characterization of a GaInAs/InP electronic waveguide T-branch switch2002Inngår i: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 91, nr 4, s. 2398-2402Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We report comprehensive microwave measurements on a T-branch switch; a GaInAs/InP electron waveguide based structure. The study includes a small signal model of the device where limitations of high frequency operation are discussed. An example of large signal operation where the nonlinearity of the device is exploited by operating the T-branch switch as a frequency multiplier is demonstrated.

  • 55.
    Lewén, Robert
    et al.
    KTH, Tidigare Institutioner, Mikroelektronik och informationsteknik, IMIT.
    Irmscher, Stefan
    KTH, Tidigare Institutioner, Mikroelektronik och informationsteknik, IMIT.
    Westergren, Urban
    KTH, Tidigare Institutioner, Elektronik.
    Thylén, Lars
    KTH, Tidigare Institutioner, Mikroelektronik och informationsteknik, IMIT.
    Eriksson, U.
    Segmented transmission-line electroabsorption modulators2004Inngår i: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 22, nr 1, s. 172-179Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We present segmented transmission-line (TML) electroabsorption modulators (EAMs) with characteristic impedance close to 50 M The segmented TML approach allows us to design a traveling-wave EAM with 50 Omega impedance and very high band width. The devices show low return loss (< -15 dB) and excellent frequency response up to 50 GHz, and exhibit a maximum model extrapolated 3 dBe bandwidth (BW) of 9,0 GHz. An effective modeling tool based on Bloch-wave analysis is derived. Design considerations and TML properties for periodic TML-EAMs are discussed.

  • 56.
    Lewén, Robert
    et al.
    KTH, Tidigare Institutioner, Mikroelektronik och informationsteknik, IMIT.
    Irmscher, Stefan
    KTH, Tidigare Institutioner, Mikroelektronik och informationsteknik, IMIT.
    Westergren, Urban
    KTH, Tidigare Institutioner, Mikroelektronik och informationsteknik, IMIT.
    Thylén, Lars
    KTH, Tidigare Institutioner, Mikroelektronik och informationsteknik, IMIT.
    Eriksson, U.
    Traveling-wave electrode electroabsorption modulators toward 100 Gb/s2004Inngår i: OSA Trends in Optics and Photonics Series: Volume 95 B, Optical Society of America, 2004, s. 561-563Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We present segmented traveling-wave electroabsorption modulators matched to 50 Ω. The devices show excellent high frequency performance up to 50 GHz, and exhibit a maximum model-extrapolated 3dBe bandwidth of 90 GHz. Clear eye openings at 50 Gbit/s are presented.

  • 57.
    Lewén, Robert
    et al.
    KTH, Tidigare Institutioner, Mikroelektronik och informationsteknik, IMIT.
    Irmscher, Stefan
    KTH, Tidigare Institutioner, Mikroelektronik och informationsteknik, IMIT.
    Westergren, Urban
    KTH, Tidigare Institutioner, Mikroelektronik och informationsteknik, IMIT.
    Thylén, Lars
    KTH, Tidigare Institutioner, Mikroelektronik och informationsteknik, IMIT.
    Eriksson, U.
    Traveling-wave electrode electroabsorption modulators toward 100 Gb/s2004Inngår i: Conf Opt Fiber Commun Tech Dig Ser, 2004, s. 561-563Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We present segmented traveling-wave electroabsorption modulators matched to 50 Ω. The devices show excellent high frequency performance up to 50 GHz, and exhibit a maximum model-extrapolated 3dBe bandwidth of 90 GHz. Clear eye openings at 50 Gbit/s are presented.

  • 58. Li, J.
    et al.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. IQSL, Hewlett-Packard Laboratories, United States .
    Bratkovski, A.
    Wang, S. -Y
    Williams, S.
    Sub-wavelengh sized optical cavity resonators with fishnet2009Inngår i: 2009 Conference on Lasers and Electro-Optics and 2009 Conference on Quantum Electronics and Laser Science Conference, CLEO/QELS, 2009, s. 5224514-Konferansepaper (Fagfellevurdert)
    Abstract [en]

    An optical cavity resonator of deep sub-wavelength size is demonstrated numerically by inserting a single layer of "fishnet" structure of next refractive index into a Fabry-Perot cavity composed of two gold films.

  • 59. Li, J.
    et al.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. Hewlett-Packard Research Lab, United States .
    Wang, S. -Y
    Comment on "stability and quality factor of a one-dimensional subwavelength cavity resonator containing a left-handed material"2009Inngår i: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 79, nr 20, s. 207101-Artikkel i tidsskrift (Fagfellevurdert)
  • 60. Li, Jingjing
    et al.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik.
    Bratkovsky, Alexander
    Wang, Shih-Yuan
    Williams, R. Stanley
    Optical magnetic plasma in artificial flowers2009Inngår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 17, nr 13, s. 10800-10805Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We report the design of an artificial flower-like structure that supports a magnetic plasma in the optical domain. The structure is composed of alternating "petals" of conventional dielectrics (epsilon > 0) and plasmonic materials (Re(epsilon) < 0). The induced effective magnetic current on such a structure possesses a phase lag with respect to the incident TE-mode magnetic field, similar to the phase lag between the induced electric current and the incident TM-mode electric field on a metal wire. An analogy is thus drawn with an artificial electric plasma composed of metal wires driven by a radio frequency excitation. The effective medium of an array of flowers has a negative permeability within a certain wavelength range, thus behaving as a magnetic plasma.

  • 61.
    Lin, Zhili
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    An analytical derivation of the optimum source patterns for the pseudospectral time-domain method2009Inngår i: Journal of Computational Physics, ISSN 0021-9991, E-ISSN 1090-2716, Vol. 228, nr 19, s. 7375-7387Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In the computational electromagnetics and acoustics, spatially smoothed sources are often utilized to alleviate the aliasing errors in the pseudospectral time-domain (PSTD) algorithms. In our work, an analytical derivation of the optimum source patterns is presented according to the accurately derived expressions of the dominant source-introduced aliasing errors according to the circular discrete convolution and Tailor series expansion method. We quantitatively demonstrate, for the first time in literature, that the aliasing errors can be optimally suppressed and rapidly reduced to the negligible levels by these optimum patterns and with the increment of source cells. We also provide the different implementation schemes of the optimal patterns both for the soft and hard source cases. The numerical calculation and 1D PSTD transient simulations are conducted to verify the excellent performance of these optimum sources.

  • 62. Lin, Zhili
    et al.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    On the Accuracy and Stability of Several Widely Used FDTD Approaches for Modeling Lorentz Dielectrics2009Inngår i: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 57, nr 10, s. 3378-3381Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A rigorous and comparative study on the approximation accuracy and stability limits of several widely used finite-difference time-domain (FDTD) approaches, namely the auxiliary differential equation (ADE) approach, the bilinear transform (BT) approach, the Z-transform approach (ZT) and the piecewise linear recursive convolution (PLRC) approach, for modeling dispersive Lorentz dielectrics is presented following the given updating equations between the electric flux density and the electric field intensity. We find the ZT approach with modified material parameters is much more accurate than the original ZT approach and the other three approaches for modeling Lorentz dielectrics. The stability limits of the ADE, ZT and PLRC approaches in simulating Lorentz dielectrics are also shown to be a bit more stringent than that of BT approach which preserves the Courant stability limit as previously reported.

  • 63. Liu, X. Y.
    et al.
    Fälth, J. F.
    Andersson, T. G.
    Holmström, Petter
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Jänes, Peter
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Ekenberg, Ulf
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Structural and optical properties of GaN/AlN multiple quantum wells for intersubband applications2005Inngår i: Journal of Crystal Growth, ISSN 0022-0248, E-ISSN 1873-5002, Vol. 278, nr 1-4, s. 397-401Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    GaN/AIN multiple quantum well structures of 1, 5 and 20 periods were grown by molecular beam epitaxy (MBE). To investigate structural parameters, symmetrical scan (0002) and reciprocal space mapping in the vicinity of the GaN (10 15) plane were made by X-ray diffraction (XRD). The layer thickness, composition and relaxation were determined and gave good agreement with simulated results. The 20 period multiple quantum well (MQW) sample exhibited an intersubband resonance at 360 meV, which corresponds well to the structure data determined by XRD.

  • 64. Liu, X. Y.
    et al.
    Holmström, Petter
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Jänes, Peter
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT).
    Andersson, T.G.
    Intersubband absorption at 1.5-3.5 µm in GaN/AlN multiple quantum wells grown by molecular beam epitaxy on sapphire2007Inngår i: Physica status solidi, ISSN 0370-1972, Vol. 244, nr 8, s. 2892-2905Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Ten and twenty period multiple quantum well structures with 1.5-5.4 nm GaN wells and 1.2-5.1 nm AlN barriers were grown on sapphire by molecular beam epitaxy. Layer thicknesses were determined by X-ray diffraction measurements and simulations. Reciprocal space mapping showed that the relaxation of the quantum well layers was independent of the buffer layer thickness. Intersubband absorption was observed by Fourier transform infrared spectroscopy at λ ∼ 1.5-3.5 μm. Monolayer fluctuations in the quantum well width induced multiple peaks in spectra, which were well fitted to Lorentzian peaks of only 57 meV linewidth. Samples were very homogeneous as the absorption peak energy varied less than 1% along ∼4 cm on 2 inch wafers. The intersubband transition energies were calculated considering the conduction-band nonparabolicity, built-in fields, strain, and many-body effects. The calculation and comparison to the fitted Lorentzian peak energies indicated a moderate blueshift due to many-body effects. It was shown by both experiments and calculations that the AlN barrier width affects the intersubband transition energy.

  • 65. Liu, X. Y.
    et al.
    Janes, P.
    Holmstrom, P.
    Aggerstam, T.
    Lourdudoss, Sebastian
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik.
    Andersson, T. G.
    Growth of GaN and GaN/AlN multiple quantum wells on sapphire, Si and GaN template by molecular beam epitaxy2007Inngår i: Journal of Crystal Growth, ISSN 0022-0248, E-ISSN 1873-5002, Vol. 300, nr 1, s. 79-82Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    GaN layers of 280 nm thick were grown on sapphire, silicon (1 1 1) and GaN template by plasma assisted molecular beam epitaxy. From atomic force microscopy and high-resolution X-ray diffraction, it was found that GaN grown on sapphire and template gave smooth surface (RMS less then 0.5 nm) and very high crystalline quality (FWHM of (0 0 0 2) scan on sapphire only 48 arcsec). However, GaN growth on Si (1 1 1) provided rough surface and poor crystalline quality. The GaN/AlN multiple quantum well structures were grown on sapphire and template. Intersubband absorption spectra from Fourier transform infrared spectroscopy indicated that layers on GaN templates had better performances than on sapphire substrates.

  • 66. Liu, X.Y
    et al.
    Aggerstam, Thomas
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Materialfysik, Halvledarmaterial, HMA.
    Jänes, Peter
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Holmström, Petter
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Lourdudoss, Sebastian
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Materialfysik, Halvledarmaterial, HMA.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik.
    Andersson, T. G.
    Investigation of intersubband absorption of GaN/AlN multiple quantum wells grown on different substrates by molecular beam epitaxy2007Inngår i: Journal of Crystal Growth, ISSN 0022-0248, E-ISSN 1873-5002, Vol. 301, nr SPEC. ISS., s. 301-302Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Ten period GaN/AlN multiple quantum well (MQW) structures were grown by plasma-assisted molecular beam epitaxy (MBE) on sapphire substrates and metal-organic vapour-phase epitaxy (MOVPE)-grown GaN templates. Samples were investigated by high-resolution X-ray diffraction (HR-XRD) and Fourier transform infrared (FT-IR) spectroscopy. Intersubband (IS) absorbances and FWHM of IS absorption peaks indicated that samples grown on the GaN templates had better characteristics, resulting in a FWHM as low as 93 meV at a peak energy of 700 meV.

  • 67.
    Lobov, G. S.
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT).
    Marinins, A.
    KTH, Skolan för informations- och kommunikationsteknik (ICT).
    Etcheverry, S.
    Zhao, Yichen
    KTH, Skolan för informations- och kommunikationsteknik (ICT).
    Vasileva, Elena
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik.
    Sugunan, A.
    Laurell, F.
    Thylén, Lars
    KTH, Skolan för bioteknologi (BIO), Teoretisk kemi och biologi.
    Wosinski, L.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik.
    Östling, Mikael
    KTH, Skolan för informations- och kommunikationsteknik (ICT).
    Toprak, M. S.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Biomedicinsk fysik och röntgenfysik.
    Popov, Sergei
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Direct birefringence and transmission modulation via dynamic alignment of P3HT nanofibers in an advanced opto-fluidic component2017Inngår i: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 7, nr 1, s. 52-61Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Poly-3-hexylthiophene (P3HT) nanofibers are semiconducting high-aspect ratio nanostructures with anisotropic absorption and birefringence properties found at different regions of the optical spectrum. In addition, P3HT nanofibers possess an ability to be aligned by an external electric field, while being dispersed in a liquid. In this manuscript we show that such collective ordering of nanofibers, similar to liquid crystal material, significantly changes the properties of transmitted light. With a specially fabricated opto-fluidic component, we monitored the phase and transmission modulation of light propagating through the solution of P3HT nanofibers, being placed in the electric field with strength up to 0.1 V/μm. This report describes a technique for light modulation, which can be implemented in optical fiber-based devices or on-chip integrated components.

  • 68.
    Lobov, Gleb S.
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Zhao, Yichen
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Funktionella material, FNM.
    Marinins, Aleksandrs
    Yan, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Li, Jiantong
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Integrerade komponenter och kretsar.
    Sugunan, Abhilash
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik.
    Thylen, Lars
    KTH, Skolan för bioteknologi (BIO).
    Wosinski, Lech
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Ostling, Mikael
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Integrerade komponenter och kretsar.
    Toprak, Muhammet S.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik.
    Popov, Sergei
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Size Impact of Ordered P3HT Nanofibers on Optical Anisotropy2016Inngår i: Macromolecular Chemistry and Physics, ISSN 1022-1352, E-ISSN 1521-3935, Vol. 217, nr 9, s. 1089-1095Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Poly-3-hexylthiophene (P3HT) nanofibers are 1D crystalline structures with semiconductor properties. When P3HT nanofi bers are dispersed in nonconducting solvent, they react to external alternate electric field by aligning along the field lines. This can be used to create layers of ordered nanofi bers and is referred to as alternating current poling method. P3HT nanofi bers with three different size distributions are fabricated, using self-assembly mechanism in marginal solvents, and used for the alignment studies. Anisotropic absorption of oriented 2 mu m long nanofi bers exponentially increases with the magnitude of applied field to a certain asymptotic limit at 0.8 V mu m(-1), while 100-500 nm long nanofi bers respond to electric field negligibly. Effective optical birefringence of oriented 2 mu m long nanofi bers is calculated, based on the phase shift at 633 nm and the average layer thickness, to be 0.41. These results combined with further studies on real-time control over orientation of P3HT nanofi bers in liquid solution or host system are promising in terms of exploiting them in electroabsorptive and electrorefractive applications.

  • 69.
    Lobov, Gleb S.
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Zhao, Yichen
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Funktionella material, FNM.
    Marinins, Aleksandrs
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Yan, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Li, Jiantong
    Toprak, Muhammet S.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Funktionella material, FNM.
    Sugunan, A.
    Thylén, Lars
    KTH, Skolan för bioteknologi (BIO). Hewlett-Packard Laboratories, United States.
    Wosinski, Lech
    KTH, Skolan för informations- och kommunikationsteknik (ICT).
    Östling, Mikael
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Integrerade komponenter och kretsar.
    Popov, Sergei
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Electric field induced optical anisotropy of P3HT nanofibers in a liquid solution2015Inngår i: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 5, nr 11, s. 2642-2647Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The nanofiber morphology of regioregular Poly-3- hexylthiophene (P3HT) is a 1D crystalline structure organized by π - π stacking of the backbone chains. In this study, we report the impact of electric field on the orientation and optical properties of P3HT nanofibers dispersed in liquid solution. We demonstrate that alternating electric field aligns nanofibers, whereas static electric field forces them to migrate towards the cathode. The alignment of nanofibers introduces anisotropic optical properties, which can be dynamically manipulated until the solvent has evaporated. Time resolved spectroscopic measurements revealed that the electro-optical response time decreases significantly with the magnitude of applied electric field. Thus, for electric field 1.3 V ·μm-1 the response time was measured as low as 20 ms, while for 0.65 V ·μm-1 it was 110-150 ms. Observed phenomenon is the first mention of P3HT supramolecules associated with electrooptical effect. Proposed method provides real time control over the orientation of nanofibers, which is a starting point for a novel practical implementation. With further development P3HT nanofibers can be used individually as an anisotropic solution or as an active component in a guest-host system.

  • 70.
    Lobov, Gleb S.
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT).
    Zhao, Yichen
    KTH, Skolan för informations- och kommunikationsteknik (ICT).
    Marinins, Aleksandrs
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Yan, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Li, Jiantong
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Integrerade komponenter och kretsar.
    Toprak, Muhammet
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Funktionella material, FNM.
    Sugunan, A.
    Thylen, Lars
    KTH, Skolan för bioteknologi (BIO).
    Wosinski, L.ech
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Fotonik och mikrovågsteknik, FMI.
    Östling, Mikael
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Integrerade komponenter och kretsar.
    Popov, Sergei Yu
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Electro-optical response of P3HT nanofibers in liquid solution2015Inngår i: Asia Communications and Photonics Conference, ACPC 2015, 2015Konferansepaper (Fagfellevurdert)
    Abstract [en]

    AC electric poling introduces in P3HT nanofibers anisotropic electro-optical response and birefringence. Along with birefringence, such material exhibits strong amplitude modulation which makes it more efficient alternative to liquid crystals. © 2015 OSA.

  • 71.
    Lobov, Gleb
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Zhao, Yichen
    KTH, Skolan för informations- och kommunikationsteknik (ICT).
    Marinins, Aleksandrs
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Yan, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Li, Jiantong
    KTH, Skolan för informations- och kommunikationsteknik (ICT).
    Sugunan, A.
    Thylén, Lars
    KTH, Skolan för bioteknologi (BIO). Hewlett-Packard Laboratories, United States.
    Wosinski, L.ech
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Fotonik och mikrovågsteknik, FMI.
    Östling, Mikael
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Integrerade komponenter och kretsar.
    Toprak, Muhammet
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Funktionella material, FNM.
    Popov, Sergei
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Dynamic Manipulation of Optical Anisotropy of Suspended Poly-3-hexylthiophene Nanofibers2016Inngår i: Advanced Optical Materials, ISSN 2195-1071, Vol. 4, nr 10, s. 1651-1656Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Poly-3-hexylthiophene (P3HT) nanofibers are 1D crystalline semiconducting nanostructures, which are known for their application in photovoltaics. Due to the internal arrangement, P3HT nanofibers possess optical anisotropy, which can be enhanced on a macroscale if nanofibers are aligned. Alternating electric field, applied to a solution with dispersed nanofibers, causes their alignment and serves as a method to produce solid layers with ordered nanofibers. The transmission ellipsometry measurements demonstrate the dichroic absorption and birefringence of ordered nanofibers in a wide spectral range of 400–1700 nm. Moreover, the length of nanofibers has a crucial impact on their degree of alignment. Using electric birefringence technique, it is shown that external electric field applied to the solution with P3HT nanofibers can cause direct birefringence modulation. Dynamic alignment of dispersed nanofibers changes the refractive index of the solution and, therefore, the polarization of transmitted light. A reversible reorientation of nanofibers is organized by using a quadrupole configuration of poling electrodes. With further development, the described method can be used in the area of active optical fiber components, lab-on-chip or sensors. It also reveals the potential of 1D conducting polymeric structures as objects whose highly anisotropic properties can be implemented in electro-optical applications.​

  • 72.
    Lobov, Gleb
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Zhao, Yichen
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Funktionella material, FNM.
    Marinins, Aleksandrs
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik.
    Yan, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik.
    Li, Jiantong
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Elektronik, Integrerade komponenter och kretsar.
    Sugunan, A.
    Thylén, Lars
    KTH, Skolan för bioteknologi (BIO), Teoretisk kemi och biologi.
    Wosinski, Lech
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik.
    Östling, Mikael
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Integrerade komponenter och kretsar.
    Toprak, Muhammet S.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Funktionella material, FNM.
    Popov, Sergei
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Optical birefringence from P3HT nanofibers in alternating electric field2014Inngår i: Optics InfoBase Conference Papers, OSA - The Optical Society , 2014Konferansepaper (Fagfellevurdert)
    Abstract [en]

    AC poling allowing to control the orientation of P3HT nanofibers, result in strong optical birefringence with promising implementation in a novel type of optical modulator, without necessary embedding into any hosting matrix, e.g. liquid crystal.

  • 73.
    Lou, Fei
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Dai, Daoxin
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Wosinski, Lech
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Design and analysis of ultra-compact EO polymer modulators based on hybrid plasmonic microring resonators2013Inngår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 21, nr 17, s. 20041-20051Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Ultra-compact EO polymer modulators based on hybrid plasmonic microring resonators are proposed, simulated and analyzed. Comparing with Si slot microring modulator, hybrid plasmonic microring modulator shows about 6-times enhancement of the figure of merit when the bending radius is around 510 nm, due to its much larger intrinsic quality factor in sub-micron radius range. Influences of the EO polymer height and Si height on the device's performance are analyzed and optimal design is given. When operating with a bias of 3.6V, the proposed device has optical modulation amplitude of 0.8 and insertion loss of about 1 dB. The estimated power consumption is about 5 fJ/bit at 100 GHz.

  • 74.
    Lou, Fei
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO. Hewlett-Packard Laboratories, United States.
    Wosinski, Lech
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Experimental demonstration of silicon-based metallic whispering gallery mode disk resonators and their thermo-tuning2014Inngår i: Conference on Optical Fiber Communication, Technical Digest Series, 2014Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Si-based metallic whispering gallery mode disks with 0.5 μm and 1 μm radii are theoretically analyzed and experimentally demonstrated. Estimated Purcell factor is around 127±42. Thermo-tuning of the device is also presented.

  • 75.
    Lou, Fei
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Wosinski, Lech
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Hybrid plasmonic microdisk resonators for optical interconnect applications2013Inngår i: Integrated Optics: Physics and Simulations, SPIE - International Society for Optical Engineering, 2013, s. 87810X-Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this paper, we present our theoretical and experimental work on hybrid plasmonic microdisks. The 170 nm wide access waveguide is first simulated and characterized, and shows a propagation loss about 0.08 dB/mu m. 3-D FDTD simulations are then used to investigate the lower limit of the bending radius of the hybrid plasmonic microdisk. Microdisks with radius around 500 nm are fabricated, characterized, and analyzed. The 5th and 4th order resonances are experimentally observed around 1412 nm and 1625 nm. The extinction ratios of the two resonances are measured to be 5.5dB and above 10dB, respectively. The measured intrinsic quality factors are 350 and 110, respectively. Comparisons are also made between the theoretical and experimental results. The demonstrated ultra-small hybrid plasmonic microdisk may find applications in low-power-consumption modulators, nano laser cavities with large Purcell-factor, molecule sensors, and others.

  • 76.
    Lou, Fei
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Wosinski, Lech
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Ultra-sharp bends based on hybrid plasmonic waveguides2014Inngår i: European Conference on Optical Communication, ECOC, 2014Konferansepaper (Fagfellevurdert)
    Abstract [en]

    To explore the potentials of hybrid plasmonics, ultrasharp 90 degree bends and resonators based on silicon waveguide and hybrid plasmonic waveguides are simulated and analyzed. Experimental demonstrations of ring and donut resonators based on hybrid plasmonics are also presented.

  • 77.
    Lou, Fei
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik.
    Wang, Zhechao
    Ghent Univ IMEC, Ghent, Belgium.
    Dai, Daoxin
    JORCEP, Hangzhou, Zhejiang, Peoples R China ; Zhejiang Univ, Hangzhou Zhejiang, Peoples R China .
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik.
    Wosinski, Lech
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik.
    Experimental demonstration of ultra-compact directional couplers based on silicon hybrid plasmonic waveguides2012Inngår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 100, nr 24, s. 241105-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Hybrid plasmonic waveguides and directional couplers have been experimentally demonstrated. Using a direct measurement method, the propagation loss of a 170 nm wide waveguide is measured to be 0.08 dB/mu m at 1550 nm when the thickness of low-index region is 56 nm. Ultra-compact directional couplers based on such hybrid plasmonic waveguides are demonstrated with gaps of 140 nm, 185 nm, 235 nm, and 290 nm. The corresponding coupling lengths measured are 1.55 mu m, 2.2 mu m, 3.2 mu m, and 4.8 mu m, respectively, which are in very good agreement with the simulations. These ultra-compact devices can be potentially used in future ultra-dense photonic integrated circuits.

  • 78.
    Lou, Fei
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik (Stängd 20120101).
    Wang, Zhechao
    Ghent University-IMEC, Belgium.
    Dai, Daoxin
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik (Stängd 20120101). KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Wosinski, Lech
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik (Stängd 20120101). KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Photonic devices based on silicon hybrid plasmonic waveguides2012Inngår i: 2012 Asia Communications And Photonics Conference (ACP), 2012, s. AS2H.2-Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A 170 nm wide hybrid plasmonic waveguide with a loss of 0,08 dB/mu m is demonstrated experimentally. Directional couplers with different gaps and microdisks with 0.5 mu m radius based on such waveguides are also presented.

  • 79.
    Lou, Fei
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Wang, Zhechao
    Ghent University, Belgium .
    Dai, Daoxin
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. Zhejiang University.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Wosinski, Lech
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Sub-wavelength microdisk resonator based on hybrid plasmonic waveguides2012Inngår i: Information Optoelectronics, Nanofabrication and Testing, IONT 2012, 2012Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Based on hybrid plasmonic waveguides, microdisk resonators with radii of 0.5 μm and FSRs of about 200 nm are simulated and experimentally demonstrated. Thermal tuning of the devices in 6 nm range is also presented.

  • 80.
    Lou, Fei
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Yan, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Qiu, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Wosinski, Lech
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Whispering gallery mode nanodisk resonator based on layered metal-dielectric waveguide2014Inngår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 22, nr 7, s. 8490-8502Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper proposes a layered metal-dielectric waveguide consisting of a stack of alternating metal and dielectric films which enables an ultracompact mode confinement. The properties of whispering gallery modes supported by disk resonators based on such waveguides are investigated for achieving a large Purcell factor. We show that by stacking three layers of 10 nm thick silver with two layers of 50 nm dielectric layers (of refractive index n) in sequence, the disk radius can be as small as 61 nm similar to lambda(0) / (7n) and the mode volume is only 0.0175 (lambda(0) / (2n))(3). When operating at 40 K, the cavity's Q-factor can be similar to 670; Purcell factor can be as large as 2.3x10(4), which is more than five times larger than that achievable in a metal-dielectric-metal disk cavity in the same condition. When more dielectric layers with smaller thicknesses are used, even more compact confinement can be achieved. For example, the radius of a cavity consisting of seven dielectric-layer waveguide can be shrunk down to lambda(0) / (13.5n), corresponding to a mode volume of 0.005 lambda(0) / (2n))(3), and Purcell factor can be enhanced to 7.3x10(4) at 40 K. The influence of parameters like thicknesses of dielectric and metal films, cavity size, and number of dielectric layers is also comprehensively studied. The proposed waveguide and nanodisk cavity provide an alternative for ultracompact light confinement, and can find applications where a strong light-matter interaction is necessary.

  • 81. Naruse, M.
    et al.
    Kim, S. -J
    Takahashi, T.
    Aono, M.
    Akahane, K.
    D'Acunto, M.
    Hori, H.
    Thylén, Lars
    KTH, Skolan för bioteknologi (BIO), Teoretisk kemi och biologi. Hewlett-Packard Laboratories, USA.
    Katori, M.
    Ohtsu, M.
    Percolation of optical excitation mediated by near-field interactions2017Inngår i: Physica A: Statistical Mechanics and its Applications, ISSN 0378-4371, Vol. 471, s. 162-168Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Optical excitation transfer in nanostructured matter has been intensively studied in various material systems for versatile applications. Herein, we theoretically and numerically discuss the percolation of optical excitations in randomly organized nanostructures caused by optical near-field interactions governed by Yukawa potential in a two-dimensional stochastic model. The model results demonstrate the appearance of two phases of percolation of optical excitation as a function of the localization degree of near-field interaction. Moreover, it indicates sublinear scaling with percolation distances when the light localization is strong. Furthermore, such a character is maximized at a particular size of environments. The results provide fundamental insights into optical excitation transfer and will facilitate the design and analysis of nanoscale signal-transfer characteristics.

  • 82. Naruse, Makoto
    et al.
    Akahane, Kouichi
    Yamamoto, Naokatsu
    Holmström, Petter
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO. Laboratory of Photonics and Microwave Engineering.
    Huant, Serge
    Ohtsu, Motoichi
    Analysis of optical near-field energy transfer by stochastic model unifying architectural dependencies2014Inngår i: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 115, nr 15, s. 154306-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We theoretically and experimentally demonstrate energy transfer mediated by optical near-field interactions in a multi-layer InAs quantum dot (QD) structure composed of a single layer of larger dots and N layers of smaller ones. We construct a stochastic model in which optical near-field interactions that follow a Yukawa potential, QD size fluctuations, and temperature-dependent energy level broadening are unified, enabling us to examine device-architecture-dependent energy transfer efficiencies. The model results are consistent with the experiments. This study provides an insight into optical energy transfer involving inherent disorders in materials and paves the way to systematic design principles of nanophotonic devices that will allow optimized performance and the realization of designated functions.

  • 83.
    Naruse, Makoto
    et al.
    Natl Inst Informat & Commun Technol, Tokyo, Japan .
    Holmström, Petter
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik, Fotonik.
    Kawazoe, Tadashi
    Univ Tokyo, Tokyo, Japan .
    Akahane, Kouichi
    Natl Inst Informat & Commun Technol, Tokyo, Japan .
    Yamamoto, Naokatsu
    Natl Inst Informat & Commun Technol, Tokyo, Japan ; Univ Tokyo, Tokyo, Japan .
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik, Fotonik.
    Ohtsu, Motoichi
    Univ Tokyo, Tokyo, Japan .
    Energy dissipation in energy transfer mediated by optical near-field interactions and their interfaces with optical far-fields2012Inngår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 100, nr 24, s. 241102-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We theoretically and experimentally evaluated energy dissipation of nanophotonic devices based on energy transfer via near-field interactions and their interfaces with optical far-fields. The lower bound is about 10(4) times more energy-efficient than electronic devices. We also examined some fundamental differences between near-field-mediated optical energy transfer logic and electrical logic in terms of energy dissipation.

  • 84. Naruse, Makoto
    et al.
    Hori, Hirokazu
    Kobayashi, Kiyoshi
    Holmström, Petter
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik, Fotonik.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik, Fotonik.
    Ohtsu, Motoichi
    Lower bound of energy dissipation in optical excitation transfer via optical near-field interactions2010Inngår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 18, nr 23, s. A544-A553Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We theoretically analyzed the lower bound of energy dissipation required for optical excitation transfer from smaller quantum dots to larger ones via optical near-field interactions. The coherent interaction between two quantum dots via optical near-fields results in unidirectional excitation transfer by an energy dissipation process occurring in the larger dot. We investigated the lower bound of this energy dissipation, or the intersublevel energy difference at the larger dot, when the excitation appearing in the larger dot originated from the excitation transfer via optical near-field interactions. We demonstrate that the energy dissipation could be as low as 25 mu eV. Compared with the bit flip energy of an electrically wired device, this is about 10(4) times more energy efficient. The achievable integration density of nanophotonic devices is also analyzed based on the energy dissipation and the error ratio while assuming a Yukawa-type potential for the optical near-field interactions.

  • 85. Parekh, D.
    et al.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT. University of California, Berkeley, United States .
    Chang-Hasnain, C. J.
    Metal nanoparticle and quantum dot metamaterials for near resonant surface plasmon waveguides2007Inngår i: 2007 International Nano-Optelectronics Workshop, iNOW, 2007, s. 150-151Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We analyze metamaterials based on silver nanospheres hosted in a lossless dielectric for use in high confinement surface plasmon waveguides. Propagation lengths and lateral confinement orders of magnitude better than bulk materials are shown.

  • 86. Ponizovskaya, Ekaterina
    et al.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Bratkovsky, Alexander
    Fu, Ying
    KTH, Skolan för bioteknologi (BIO), Teoretisk kemi.
    Binary metal and semiconductor quantum dot metamaterials with negative optical dielectric constant and compensated loss for small volume waveguides, modulators and switches2009Inngår i: Applied Physics A: Materials Science & Processing, ISSN 0947-8396, E-ISSN 1432-0630, Vol. 95, nr 4, s. 1029-1032Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We study numerically and analytically a binary mixture of quantum dots exhibiting gain and loss. For a mixture of gain quantum dots and silver nanoparticles, we find conditions when the composite shows negative dielectric constant operation and lossless operation. The composites of this kind may be used for dense integration of photonic components as well as modulation and switching in optical interconnect systems.

  • 87.
    Qiu, Min
    et al.
    KTH, Tidigare Institutioner, Mikroelektronik och informationsteknik, IMIT.
    Mulot, Mikael
    KTH, Tidigare Institutioner, Mikroelektronik och informationsteknik, IMIT.
    Swillo, Marcin
    KTH, Tidigare Institutioner, Mikroelektronik och informationsteknik, IMIT.
    Srinivasan, Anand
    KTH, Tidigare Institutioner, Mikroelektronik och informationsteknik, IMIT.
    Jaskorzynska, Bozena
    KTH, Tidigare Institutioner, Mikroelektronik och informationsteknik, IMIT.
    Karlsson, Anders
    KTH, Tidigare Institutioner, Mikroelektronik och informationsteknik, IMIT.
    Thylén, Lars
    KTH, Tidigare Institutioner, Mikroelektronik och informationsteknik, IMIT.
    Optical add/drop filters using two-dimensional photonic crystals2004Inngår i: Proceedings of SPIE - The International Society for Optical Engineering, 2004, s. 286-295Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Optical add/drop filters using two-dimensional photonic crystals (PC's) are presented for different designs. In-plane channel add/drop filter composed of two waveguides and an optical resonator system is very compact, but sensitive to the losses. While add/drop filter based on a contra-directional PC waveguide coupler is much more robust to the losses, and reasonable compactness is possible with careful designs. The possibility to utilize the PC dispersion properties to design optical filters is also discussed briefly.

  • 88.
    Qiu, Min
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Ruan, Zhichao
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Berrier, Audrey
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Xiao, S S
    Mulot, M.
    Swillo, M.
    Anand, Srinivasan
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    He, Sailing
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Thylen, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik, Fotonik.
    Negative refraction in semiconductor photonic crystals2005Inngår i: SEMICONDUCTOR AND ORGANIC OPTOELECTRONIC MATERIALS AND DEVICES, 2005, Vol. 5624, s. 345-352Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The coupling efficiency between external plane waves and the Bloch waves in photonic crystals are investigated. It is found that the coupling coefficient is highly angular dependent even for an interface between air n=l and a photonic crystal with effective index -1. It is also shown that, for point imaging by a photonic crystal slab owing to the negative refraction, the influence of the surface termination to the transmission and the imaging quality is significant. Finally, we present results demonstrating experimentally negative refraction in a two-dimensional photonic crystal.

  • 89.
    Qiu, Min
    et al.
    KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
    Thylén, Lars
    KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
    Swillo, Marcin
    Jaskorzynska, Bozena
    KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
    Wave propagation through a photonic crystal in a negative phase refractive-index region2003Inngår i: IEEE Journal of Selected Topics in Quantum Electronics, ISSN 1077-260X, E-ISSN 1558-4542, Vol. 9, nr 1, s. 106-110Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The wave propagation through a photonic crystal with a triangular lattice of air holes realized in the InP-InGaAsP heterostructure are studied theoretically for the transverse magnetic modes. The photonic crystal possesses a negative refractive index, and the self-focus of the beam is successfully observed. The weak side beams are observed due to high-order Bloch waves in the photonic crystal. The coupling efficiency for the outgoing waves to a waveguide is also studied.

  • 90.
    Qiu, Min
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Xiao, S.
    Berrier, A.
    Anand, Srinivasan
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik.
    Mulot, M.
    Swillo, Marcin
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Ruan, Z.
    He, Sailing
    KTH, Skolan för elektro- och systemteknik (EES), Elektroteknisk teori och konstruktion.
    Negative refraction in two-dimensional photonic crystals2005Inngår i: Applied Physics A: Materials Science & Processing, ISSN 0947-8396, E-ISSN 1432-0630, Vol. 80, nr 6, s. 1231-1236Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We present some of our recent results for negative refraction in photonic crystals. The concept of negative refraction in photonic crystals is firstly introduced. Then, the propagation of electromagnetic waves in photonic crystals is systematically studied. By the layer Korringa-Kohn-Rostoker method, the coupling efficiency between external plane waves and the Bloch waves in photonic crystals is investigated. It is found that the coupling coefficient is highly angular dependent even for an interface between air with n=1 and a photonic crystal with effective index n(eff)=-1. It is also shown that, for point imaging by a photonic crystal slab, owing to the negative refraction, the influence of the surface termination on the transmission and the imaging quality is significant. Finally, we present results experimentally demonstrating negative refraction in a two-dimensional photonic crystal at optical communication wavelengths.

  • 91. Rong, Y.
    et al.
    Ge, Y.
    Huo, Y.
    Fiorentino, M.
    Kamins, T. I.
    Ochalski, T.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik (Stängd 20120101), Fotonik (Stängd 20120101).
    Chacinski, Marek
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik (Stängd 20120101), Fotonik (Stängd 20120101).
    Harris, J. S.
    High speed optical modulation in Ge quantum wells using quantum confined stark effect2009Inngår i: Group IV Photonics, 2009. GFP '09. 6th IEEE International Conference on, 2009, s. 157-159Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We designed the coplanar high-speed modulator with Ge/SiGe quantum wells, and demonstrated 25GHz of modulation with 3.125GHz of eye diagram using quantum-confined stark effect.

  • 92. Rong, Y.
    et al.
    Huo, Y.
    Fei, E. T.
    Fiorentino, M.
    Tan, M. R. T.
    Ochalski, T.
    Huyet, G.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Chacinski, Marek
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Kamins, T. I.
    Harris, J. S.
    High speed optical modulation in Ge quantum wells using quantum confined stark effect2012Inngår i: Frontiers of Optoelectronics, ISSN 2095-2759, Vol. 5, nr 1, s. 82-89Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We focus on the optimization of SiGe material deposition, the minimization of the parasitic capacitance of the probe pads for high speed, low voltage and high contrast ratio operation. The device fabrication is based on processes for standard Si electronics and is suitable for mass-production. We present observations of quantum confinement and quantum-confined Stark effect (QCSE) electroabsorption in Ge quantum wells (QWs) with SiGe barriers grown on Si substrates. Though Ge is an indirect gap semiconductor, the resulting effects are at least as clear and strong as seen in typical III-V QWstructures at similar wavelengths. We also demonstrated a modulator, with eye diagrams of up to 3. 5 GHz, a small driving voltage of 2. 5 V and a modulation bandwidth at about 10 GHz. Finally, carrier dynamics under ultra-fast laser excitation and high-speed photocurrent response are investigated.

  • 93.
    Ruan, Zhichao
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Qui, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Xiao, Sanshui
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    He, Sailing
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Coupling between plane waves and Bloch waves in photonic crystals with negative refraction2005Inngår i: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 71, nr 4, s. 045111-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A comprehensive analysis of the coupling coefficients between plane waves in conventional dielectric media and Bloch waves of photonic crystals with effective negative refractions is performed by the layer Korringa-Kohn-Rostoker method. Employing the infinite layers refraction operator, semi-infinite size photonic crystals are considered. Some special coupling properties are discussed. In particular, the strong angular dependence of coupling coefficients is found even for an interface between air (n=1) and a photonic crystal with effective refractive index (n(eff)=-1). Thus, a negative refractive index defined by the radius of a circular equal-frequency contour does not guarantee an isotropic behavior.

  • 94. Silfvenius, C.
    et al.
    Swillo, M.
    Claesson, J.
    Forsberg, E.
    Akram, N.
    Chacinski, Marek
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik (Stängd 20120101), Fotonik (Stängd 20120101).
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik (Stängd 20120101). KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Kista Photonics Research Center, KPRC.
    InP-based monolithically integrated 1310/1550nm diplexer/triplexer2008Inngår i: Proceedings of SPIE - The International Society for Optical Engineering, 2008Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We demonstrate a low cost, non-butt-joint, wide-gain integrated device comprising 1550nm lasers, wavelength selective couplers and 1310nm sensitive photodiodes for diplexer arrays for FTTH use.

  • 95.
    Sun, Xu
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Dai, D.
    Wu, H.
    Thylén, Lars
    KTH, Skolan för bioteknologi (BIO), Teoretisk kemi och biologi. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Wosinski, Lech
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Highly-efficient graphene-based silicon hybrid plasmonic waveguide modulator2017Inngår i: Optics InfoBase Conference Papers, Optics Info Base, Optical Society of America, 2017, Vol. Part F52Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A graphene-based silicon hybrid plasmonic waveguide modulator with 25GHz 3dB bandwidth is proposed in this work. Due to high optical power density at the graphene layers, modulation depth can reach as high value as 0.95dB/μm.

  • 96.
    Sun, Xu
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Dai, Daoxin
    Thylen, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Wosinski, Lech
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    High-sensitivity liquid refractive-index sensor based on a Mach-Zehnder interferometer with a double-slot hybrid plasmonic waveguide2015Inngår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 23, nr 20, s. 25688-25699Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A Mach-Zehnder Interferometer (MZI) liquid sensor, employing ultra-compact double-slot hybrid plasmonic (DSHP) waveguide as active sensing arm, is developed. Numerical results show that extremely large optical confinement factor of the tested analytes (as high as 88%) can be obtained by DSHP waveguide with optimized geometrical parameters, which is larger than both, conventional SOI waveguides and plasmonic slot waveguides with same widths. As for MZI sensor with 40 mu m long DSHP active sensing area, the sensitivity can reach as high value as 1061nm/RIU (refractive index unit). The total loss, excluding the coupling loss of the grating coupler, is around 4.5dB.

  • 97.
    Sun, Xu
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Fotonik och mikrovågsteknik, FMI. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Dai, Daoxin
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. Zhejiang-KTH Joint Research Center of Photonics, JORCEP .
    Thylén, Lars
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Fotonik och mikrovågsteknik, FMI. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. Hewlett-Packard Laboratories, Palo Alto, CA 94304, USA.
    Wosinski, Lech
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Fotonik och mikrovågsteknik, FMI. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. JORCEP, Joint Research Center of Photonics of the Royal Institute of Technology (Sweden) and Zhejiang University (China), Hangzhou, 310058, China.
    Double-Slot Hybrid Plasmonic Ring Resonator Used for Optical Sensors and Modulators2015Inngår i: Photonics, E-ISSN 2304-6732, Vol. 2, nr 4, s. 1116-1130Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    An ultra-high sensitivity double-slot hybrid plasmonic (DSHP) ring resonator, used for optical sensors and modulators, is developed. Due to high index contrast, as well as plasmonic enhancement, a considerable part of the optical energy is concentrated in the narrow slots between Si and plasmonic materials (silver is used in this paper), which leads to high sensitivity to the infiltrating materials. By partial opening of the outer plasmonic circular sheet of the DSHP ring, a conventional side-coupled silicon on insulator (SOI) bus waveguide can be used. Experimental results demonstrate ultra-high sensitivity (687.5 nm/RIU) of the developed DSHP ring resonator, which is about five-times higher than for the conventional Si ring with the same geometry. Further discussions show that a very low detection limit (5.37 × 10−6 RIU) can be achieved after loaded Q factor modifications. In addition, the plasmonic metal structures offer also the way to process optical and electronic signals along the same hybrid plasmonic circuits with small capacitance (~0.275 fF) and large electric field, which leads to possible applications in compact high-efficiency electro-optic modulators, where no extra electrodes for electronic signals are required

  • 98.
    Sun, Xu
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Optik och Fotonik, OFO. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Thylén, Lars
    KTH, Skolan för bioteknologi (BIO), Teoretisk kemi och biologi. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Wosinski, L.ech
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Optik och Fotonik, OFO. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Hollow hybrid plasmonic Mach-Zehnder sensor2017Inngår i: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 42, nr 4Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A Mach–Zehnder interferometer (MZI)-based liquid refractiveindex sensor, utilizing a hollow hybrid plasmonic (HP)waveguide as the sensing element, has been investigated,showing large sensitivity to the refractive index changesof the tested liquids, as well as lower propagation loss incomparison to typical plasmonic waveguide-based ones.The sensor is fabricated using conventional silicon-oninsulator(SOI) technology; therefore, it is compatible toother standard SOI devices. The waveguide sensitivity, Sw,is experimentally demonstrated to be 0.64, with a propagationloss less than 0.25 dB/μm. Using a 20 μm long hollowHP waveguide in the sensing arm, the sensitivity of the MZIsensor (device sensitivity, Sd ) is about 160 nm/RIU, with anextinction ratio larger than 40 dB.

  • 99.
    Sun, Xu
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Optik och Fotonik, OFO. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Thylén, Lars
    KTH, Skolan för bioteknologi (BIO), Teoretisk kemi och biologi. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Wosinski, Lech
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Optik och Fotonik, OFO. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Hollow Hybrid Plasmonic Waveguide Used for Electro-optic Phase Modulation2016Inngår i: Optics InfoBase Conference Papers, Optical Society of America, 2016, s. AF3F.2-Konferansepaper (Fagfellevurdert)
    Abstract [en]

    An electro-optic polymer-based hollow hybrid plasmonic phase modulator has beenproposed. Estimating from our preliminary experimental results, related to a hollow HP liquidsensor, the proposed device shows unique advantages in high speed modulation applications.

  • 100.
    Sun, Xu
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Optik och Fotonik, OFO. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Thylén, Lars
    KTH, Skolan för bioteknologi (BIO), Teoretisk kemi och biologi. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Wosinski, L.ech
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Optik och Fotonik, OFO. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    MEMS Tunable Hybrid Plasmonic-Si Waveguide2017Inngår i: OSA Technical Digest (online), 2017, s. Th2A.6-Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A MEMS tunable hybrid plasmonic-Si (HP) waveguide is investigated, showing verylarge changes of both effective refractive index and propagation loss when applying bias voltage.Preliminary experimental results show that: with 15μm MEMS structure in Si waveguideplatform, the extinction ratio can be over 20dB between “on” and “off” states.

1234 51 - 100 of 171
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