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  • 101. Olivier, S.
    et al.
    Benisty, H.
    Rattier, M.
    Weisbuch, C.
    Qiu, Min
    KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
    Karlsson, Anders
    KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
    Smith, C. J. M.
    Houdre, R.
    Oesterle, U.
    Resonant and nonresonant transmission through waveguide bends in a planar photonic crystal2001Ingår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 79, nr 16, s. 2514-2516Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We have measured the near-infrared transmission spectra of 60 degrees bends defined in two-dimensional photonic crystal waveguides consisting of three missing rows. Two limit cases are studied: a basic nonresonant bend and a bend built around a resonant lozenge cavity, which is found to exhibit peaked transmission. Finite-difference-time-domain simulations show very good agreement with the data allowing general design issues for efficient bends to be discussed.

  • 102.
    Qiu, Min
    KTH, Tidigare Institutioner, Teoretisk elektroteknik.
    Analysis of guided modes in photonic crystal fibers using the finite-difference time-domain method2001Ingår i: Microwave and optical technology letters (Print), ISSN 0895-2477, E-ISSN 1098-2760, Vol. 30, nr 5, s. 327-330Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An efficient finite-difference time-domain method is proposed for the full-wave analysis of guided modes in photonic crystal fibers. The three-dimensional hybrid guided modes can be calculated by a two-dimensional mesh, if one assumes that the propagation constant along the z-direction (propagation direction) is fixed. Furthermore, only real variables are used in the present method. Therefore, the computation time and computer memory are significantly reduced. The results for a honeycomb-based silica-air photonic crystal fiber are in very good agreement with the results from the plane-wave expansion method.

  • 103.
    Qiu, Min
    KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
    Band gap effects in asymmetric photonic crystal slabs2002Ingår i: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 66, nr 3Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    It is found that the band gap effect does exist in asymmetric photonic crystal slabs, although there are no separable noninteracting subsets of the modes. This is obtained through band structures analysis, rather than the structures are approximated as symmetric if the modes are sufficiently localized. The band edge of the gap is decided by the fundamental TE0-like and TM0-like modes. It is also shown that waveguides (line defects) in asymmetric photonic crystal slabs could support lossless guided modes inside the band gap region.

  • 104.
    Qiu, Min
    KTH, Tidigare Institutioner                               , Signaler, sensorer och system.
    Computational methods for the analysis and design of photonic bandgap structures2000Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    In the present thesis, computational methods for theanalysis and design of photonic bandgap structure areconsidered. Many numerical methods have been used to study suchstructures. Among them, the plane wave expansion method is veryoften used. Using this method, we show that inclusions ofelliptic air holes can be used effectively to obtain a largercomplete band gap for two-dimensional (2D) photonic crystals.An optimal design of a 2D photonic crystal is also consideredin the thesis using a combination of the plane wave expansionmethod and the conjugate gradient method. We find that amaximum complete 2D band gap can be obtained by connectingdielectric rods with veins for a photonic crystal with a squarelattice of air holes in GaAs.

    For some problems, such as defect modes, the plane waveexpansion method is extremely time-consuming. It seems that thefinite-difference time-domain (FDTD) method is promising, sincethe computational time is proportional to the number of thediscretization points in the computation domain (i.e., it is oforderN). A FDTD scheme in a nonorthogonal coordinate systemis presented in the thesis to calculate the band structure of a2D photonic crystal consisting of askew lattice. The algorithmcan easily be used for any complicated inclusion configuration,which can have both the dielectric and metallic constituents.The FDTD method is also applied to calculate the off-plane bandstructures of 2D photonic crystals in the present thesis. Wealso propose a numerical method for computing defect modes in2D crystals (with dielectric or metallic inclusions). Comparedto the FDTD transmission spectra method, our method reduces thecomputation time and memory significantly, and finds as manydefect modes as possible, including those that are not excitedby an incident plane wave in the FDTD transmission spectramethod. The FDTD method has also been applied to calculateguided modes and surface modes in 2D photonic crystals using acombination of the periodic boundary condition and theperfectly matched layer for the boundary treatment. Anefficient FDTD method, in which only real variables are used,is also proposed for the full-wave analysis of guided modes inphotonic crystal fibers.

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  • 105.
    Qiu, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Control of slow light in coupled resonator optical waveguide structures with highly dispersive media2008Ingår i: AOE 2007: ASIA OPTICAL FIBER COMMUNICATION & OPTOELECTRONIC EXPOSITION & CONFERENCE, CONFERENCE PROCEEDINGS, SHENZHEN: AOE , 2008, s. 602-602Konferensbidrag (Refereegranskat)
    Abstract [en]

    Dispersive material background may enable dynamic tunability of slow light of the coupled resonator optical waveguides. It may also results in an enhanced transmission spectrum with a time-dependent tuning of the dispersive medium.

  • 106.
    Qiu, Min
    KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
    Effective index method for heterostructure-slab-waveguide-based two-dimensional photonic crystals2002Ingår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 81, nr 7, s. 1163-1165Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The validity of the two-dimensional approximation by the effective index method for heterostructure-slab-waveguide-based two-dimensional photonic crystals is tested against the full-vectorial three-dimensional finite-difference time-domain calculations. A good agreement over a wide frequency range is obtained for the band structures of two-dimensional photonic crystals in a low-index-contrast heterostructure. For high-index-contrast heterostructures, the effective index method is still valid, but only for much narrower frequency range.

  • 107.
    Qiu, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Micro-cavities in silicon-on-insulator photonic crystal slabs: Determining resonant frequencies and quality factors accurately2005Ingår i: Microwave and optical technology letters (Print), ISSN 0895-2477, E-ISSN 1098-2760, Vol. 45, nr 5, s. 381-385Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Micro-cavities in two-dimensional silicon-on-insulator (SOI) photonic-crystal slabs are studied. A combination of the finite-difference time-domain (FDTD) technique and the Pad approximation with Baker's algorithm is used to accurately compute the resonant-frequencies and quality,factors simultaneously. The simulations show that, for similar cavity structures, the mode quality factors of cavities in SOI-type photonic-crystal slabs are much smaller than those in membrane photonic-crystal slabs, and deep etching of air holes is still required to obtain relatively higher Omega.

  • 108.
    Qiu, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Photonic band structures for surface waves on structured metal surfaces2005Ingår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 13, nr 19, s. 7583-7588Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Photonic band structures of surface modes on structured metal surfaces with periodic holes in them are obtained using the full-vectorial finite-difference time-domain method. Surface modes do exist for almost all investigated lattice types with any hole size, shape and depth. The results for a square lattice of wax-filled box holes in brass are also in very good agreement with the experimental results. We also show that, for structured surfaces with holes of finite depth, the holes might act as cavities. Thus there exist propagating coupled cavity modes with low group velocity, confined at the surface and decaying exponentially into the dielectric above.

  • 109.
    Qiu, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Photonic crystal and plasmonic devices for photonic integration2008Ingår i: AOE 2007: ASIA OPTICAL FIBER COMMUNICATION & OPTOELECTRONIC EXPOSITION & CONFERENCE, CONFERENCE PROCEEDINGS, SHENZHEN: AOE , 2008, s. 162-163Konferensbidrag (Refereegranskat)
    Abstract [en]

    Our recent research results on photonic crystal and plasmonic devices for photonic integration are reviewed here. Silicon-based photonic crystal waveguides, microcavities, and filters, as well as plasmonic waveguides will be presented.

  • 110.
    Qiu, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik, Fotonik.
    Silicon Photonic Crystal Surface Mode Microcavities2008Ingår i: 2008 IEEE PHOTONICSGLOBAL@SINGAPORE (IPGC), VOLS 1 AND 2, NEW YORK: IEEE , 2008, s. 15-18Konferensbidrag (Refereegranskat)
    Abstract [en]

    High-Q surface mode micro-cavities in silicon-on-insulator (SOI) structures are investigated. Cavity structures in amorphous silicon based SOI structures show intrinsic Q values of 2000, while cavities in crystalline SOI structures can have intrinsic Q values larger than 10(4).

  • 111.
    Qiu, Min
    KTH, Tidigare Institutioner, Mikroelektronik och informationsteknik, IMIT.
    Ultra-compact optical filter in two-dimensional photonic crystal2004Ingår i: Electronics Letters, ISSN 0013-5194, E-ISSN 1350-911X, Vol. 40, nr 9, s. 539-540Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A design of an ultra-compact in-plane optical add/drop filter is proposed. The filter is formed by two waveguides and one two-mode cavity in a two-dimensional triangular photonic crystal. The simulated results demonstrate good transfer characteristics with a quality factor of about 1700.

  • 112.
    Qiu, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Vertically coupled photonic crystal optical filters2005Ingår i: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 30, nr 12, s. 1476-1478Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A novel design of optical filters, based on the vertical coupling between channel waveguides and photonic crystal microcavities, is proposed. The choice of channel waveguides can be arbitrary because of the flexibility of the device geometry, which makes it possible to utilize conventional low-loss waveguides. The separation between waveguides and microcavities, which determines filter bandwidths and drop efficiencies, can be accurately controlled by material growth (or deposition). The filters might also be switchable, e.g., by mechanical movements of microcavities. An example of a reflection-type optical filter is demonstrated in numerical experiments using the finite-difference time-domain method.

  • 113.
    Qiu, Min
    et al.
    KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
    Azizi, K.
    Karlsson, Anders
    KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
    Swillo, Marcin
    KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
    Jaskorzynska, Bozena
    KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
    Numerical studies of mode gaps and coupling efficiency for line-defect waveguides in two-dimensional photonic crystals2001Ingår i: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 6415, nr 15Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Using conventional waveguides. for light coupling and collection we numerically study band structures and transmission spectra for guided modes in line-defect waveguides. obtained by removing rows of air holes in a lossless triangular-lattice two-dimensional photonic crystal. The two-dimensional finite-difference time-domain method combined with the effective index method and complemented with the coupled mode approximation is employed to analyze mode-gaps (or mini stopbands) arising from Bragg diffraction of the incident mode into the counterpropagating modes. We also show that more than 97% coupling efficiency between the ridge and the photonic crystal waveguides. is achievable by adjustment of the ridge waveguide width.

  • 114.
    Qiu, Min
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO. Zhejiang University, China.
    Chen, Xi
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Shi, Yuechun
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Chen, Yiting
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Gong, H.
    Zhao, D.
    Yang, Y.
    Yan, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Li, Q.
    Plasmonic enhanced photothermal effects and its applications2014Konferensbidrag (Refereegranskat)
    Abstract [en]

    We review here our recent studies on plasmonic enhanced photothermal effects in metallic nanostructure, and the applications of such effects. When light is shined on a prefect metamaterial absorber patterned with e-beam lithography, the gold nanoparticles (NPs) forming the absorber can be either transformed to nano-spherical-domes, or to truncated-octahedral shaped or multi-twined nanocrystals with large crystal grain sizes and flat boundary facets. The evolution of morphology and crystallinity of the gold NPs can be also observed. Evidences clearly show that the surface melting and the coalescence mechanism play a key role on nanocrystals formation. These melted gold nanospheres can even be transferred to another substrate, on which the transferred NPs exhibit excellent size uniformity. The strong photothermal effects can also be utilized to tune silicon photonics waveguides and resonators. It is shown that all-optical photothermal switching of Mach-Zehnder interferometers (MZI), silicon disk resonators, and silicon ring resonators is possible with the help of plasmonic nanoheaters. The switching response time and power consumption are all at reasonably low level.

  • 115.
    Qiu, Min
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Chen, Yiting
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Chen, Xi
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Wang, Jing
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Hao, Jiaming
    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.
    Photothermal effects in a plasmonic metamaterial structure2011Konferensbidrag (Refereegranskat)
    Abstract [en]

    Heat generation due to photothermal effects in plasmonic nanostructures have generated many important applications, due to the strong enhancement of light absorption through plasmonic resonance at visible and near-infrared region. In this talk, we review our recent experimental efforts on photothermal effects in a metamaterial nanostructure, which has an ultrasensitive heating response owing to plasmonic resonance. We observed close-to-instantaneous fusion and re-shaping of the nanoparticles with a nanosecond pulse train. The generated heat profile has a subwavelength resolution, and the resonance wavelength can be in principle tailored to arbitrary wavelength region by choosing an appropriate geometry for the resonator structure.

  • 116.
    Qiu, Min
    et al.
    KTH, Tidigare Institutioner, Teoretisk elektroteknik.
    He, Sailing
    KTH, Tidigare Institutioner, Teoretisk elektroteknik.
    A nonorthogonal finite-difference time-domain method for computing the band structure of a two-dimensional photonic crystal with dielectric and metallic inclusions2000Ingår i: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 87, nr 12, s. 8268-8275Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A finite-difference time-domain scheme in a nonorthogonal coordinate system is presented to calculate the band structure of a two-dimensional photonic crystal consisting of a skew lattice. The method can be used for a photonic crystal of complicated configuration, such as a photonic crystal with both dielectric and metallic inclusions. The method is verified by comparing with the results obtained by other methods for some special cases. The band structure of a photonic crystal with a dielectric layer coated on a metallic cylinder as an inclusion is studied. For such a case, it is noticed that both the dielectric and metallic characteristics of the band structure are inherited.

  • 117.
    Qiu, Min
    et al.
    KTH, Tidigare Institutioner, Teoretisk elektroteknik.
    He, Sailing
    KTH, Tidigare Institutioner, Teoretisk elektroteknik.
    FDTD algorithm for computing the off-plane band structure in a two-dimensional photonic crystal with dielectric or metallic inclusions2001Ingår i: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 278, nr 6, s. 348-354Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An effective numerical method based on the finite-difference time-domain scheme for computing the off-plane band structure of a two-dimensional photonic crystal is presented. The method is an order N method, and requires only a two-dimensional discretization mesh for a given off-plant wave number k(z) although thr off-plane propagation is a three-dimensional problem. The computation time and memory required is thus reduced significantly. The present method can be used for any type of inclusions and no additional effort is needed for metallic inclusions. The off-plane band structures of a square lattice of metallic rods in the air are studied, and a complete bandgap for some nonzero off-plane wave number k(z) is found.

  • 118.
    Qiu, Min
    et al.
    KTH, Tidigare Institutioner, Teoretisk elektroteknik.
    He, Sailing
    KTH, Tidigare Institutioner, Teoretisk elektroteknik.
    Guided modes in a two-dimensional metallic photonic crystal waveguide2000Ingår i: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 266, nr 4-6, s. 425-429Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Guided modes in a two-dimensional metallic photonic crystal waveguide are studied. The guided modes in the photonic crystal waveguide are related to those in a conventional metallic waveguide. There exists a cutoff frequency and consequently a mode gap at low frequencies (starting from zero frequency) in the photonic crystal metallic waveguide.

  • 119.
    Qiu, Min
    et al.
    KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
    He, Sailing
    KTH, Tidigare Institutioner                               , Teoretisk elektroteknik.
    High-directivity patch antenna with both photonic bandgap substrate and photonic bandgap cover2001Ingår i: Microwave and optical technology letters (Print), ISSN 0895-2477, E-ISSN 1098-2760, Vol. 30, nr 1, s. 41-44Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A new patch antenna system, which has both a photonic bandgap (PBG) substrate and a PBG cover, is proposed in the present paper. The impedance, radiation pattern, and directivity of such an antenna are studied by the finite-different time-domain method. The results show that the directivity of the PBG antenna is significantly improved. The dependence of the directivity on the frequency and other parameters is also studied.

  • 120.
    Qiu, Min
    et al.
    KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
    He, Sailing
    KTH, Tidigare Institutioner                               , Teoretisk elektroteknik.
    Interference of signals in parallel waveguides in a two-dimensional photonic crystal2001Ingår i: Physica. B, Condensed matter, ISSN 0921-4526, E-ISSN 1873-2135, Vol. 299, nr 02-jan, s. 187-193Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The interference of signals in parallel waveguides in a two-dimensional photonic crystal is studied and compared for two different types of waveguides, namely, an air waveguide formed by removing a row of dielectric columns, and a dielectric waveguide formed by introducing a dielectric slab inside the photonic crystal. For the case of air waveguides, two such parallel waveguides should be separated by at least five rows of dielectric columns to avoid interference between signals (with frequencies in the band gap) traveling in different waveguides. For the case of dielectric slab waveguides, one can achieve very low energy leakage (with negligible interference) between two such waveguides even if they are separated by only a single row of dielectric columns. A dielectric slab waveguide in a photonic crystal is more efficient for confining the electromagnetic energy inside the waveguide than an air waveguide in the photonic crystal.

  • 121.
    Qiu, Min
    et al.
    KTH, Tidigare Institutioner                               , Teoretisk elektroteknik.
    He, Sailing
    KTH, Tidigare Institutioner                               , Teoretisk elektroteknik.
    Large complete band gap in two-dimensional photonic crystals with elliptic air holes1999Ingår i: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 60, nr 15, s. 10610-10612Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    It is shown that elliptic air heres can be used effectively as inclusions to obtain a large complete band gap for two-dimensional photonic crystals. An instructive procedure of how one quickly finds the optimal configuration which gives the maximum complete band gap is described.

  • 122.
    Qiu, Min
    et al.
    KTH, Tidigare Institutioner, Teoretisk elektroteknik.
    He, Sailing
    KTH, Tidigare Institutioner, Teoretisk elektroteknik.
    Numerical method for computing defect modes in two-dimensional photonic crystals with dielectric or metallic inclusions2000Ingår i: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 61, nr 19, s. 12871-12876Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A numerical method based on the finite-difference time-domain (FDTD) scheme for computing defect modes in two-dimensional photonic crystals (with dielectric or metallic inclusions) is presented. Compared to the FDTD transmission spectra method, the present method reduces the computation domain significantly. By means of it one can find as many defect modes as possible, including those that are inactive to the incident plane wave in the FDTD transmission spectra method. The calculated eigenfrequencies and field patterns for a defect in a square array of dielectric rods are consistent with those obtained by the plane wave expansion method. Modes for a defect in a square array of copper rods are also studied, and the calculated eigenfrequencies are in a very good agreement with experimental results.

  • 123.
    Qiu, Min
    et al.
    KTH, Tidigare Institutioner, Teoretisk elektroteknik.
    He, Sailing
    KTH, Tidigare Institutioner, Teoretisk elektroteknik.
    Optimal design of a two-dimensional photonic crystal of square lattice with a large complete two-dimensional bandgap2000Ingår i: Journal of the Optical Society of America. B, Optical physics, ISSN 0740-3224, E-ISSN 1520-8540, Vol. 17, nr 6, s. 1027-1030Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Optimal design of a two-dimensional photonic crystal with a square lattice of air holes in GaAs is considered. It is shown how a maximum complete two-dimensional band gap is obtained by optimally connecting the dielectric rods with veins. The complete two-dimensional bandgap of our optimal design reaches Delta omega = 0.0762(2 pi c/a) (a is the lattice constant).

  • 124.
    Qiu, Min
    et al.
    KTH, Tidigare Institutioner, Teoretisk elektroteknik.
    He, Sailing
    KTH, Tidigare Institutioner, Teoretisk elektroteknik.
    Surface modes in two-dimensional dielectric and metallic photonic band gap structures: a FDTD study2001Ingår i: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 282, nr 1-2, s. 85-91Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In the present Letter, surface modes in two-dimensional dielectric and metallic photonic crystals are studied by a finite-difference time-domain method. The existence of surface modes in metallic photonic crystals is examined. The influence of surface waves on dielectric photonic crystal antennas is also studied.

  • 125.
    Qiu, Min
    et al.
    KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
    Jaskorzynska, Bozena
    KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
    Design of a channel drop filter in a two-dimensional triangular photonic crystal2003Ingår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 83, nr 6, s. 1074-1076Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A design of a channel drop filter in a two-dimensional photonic crystal with a triangular lattice of air holes is presented. The requirement of the accidental degeneracy of the frequency is achieved by tuning the radii of the air holes in the cavity system. In contrast to the other designs proposed, the present one does not involve either inclusion of additional materials or an extra small feature size.

  • 126.
    Qiu, Min
    et al.
    KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
    Jaskorzynska, Bozena
    KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
    Swillo, Marcin
    KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
    Benisty, H.
    Time-domain 2D modeling of slab-waveguide-based photonic-crystal devices in the presence of radiation losses2002Ingår i: Microwave and optical technology letters (Print), ISSN 0895-2477, E-ISSN 1098-2760, Vol. 34, nr 5, s. 387-393Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Devices based on two-dimensional (2D) photonic crystals (PCs) arc typically realized as 3D structures consisting of an array of holes (or rods) vertically etched through a slab waveguide. The existence of holes in a slob waveguide may induce strong radiation losses to the slab claddings. Exact modeling of devices affected by such losses requires 3D calculations. In the present Letter, with the use of the effective-index method to account for the vertical confinement and the effective losses method by the nonvanishing conductivity, the 3D modeling is reduced into 2D. It is then shown that good agreement with experiments can be obtained for slab-waveguide-based photonic crystal devices.

  • 127.
    Qiu, Min
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Li, Q.
    Zhang, W.
    Meng, L.
    Zhao, D.
    Chen, Xi
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Chen, Yiting
    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.
    Nanostructured plasmonic devices and their applications2013Ingår i: 2013 IEEE 6th International Conference on Advanced Infocomm Technology, ICAIT 2013, IEEE , 2013, s. 79-80Konferensbidrag (Refereegranskat)
    Abstract [en]

    In this talk, we will review our recent works on nanostructured plasmonic devices, and their applications in high performance light absorption, photothermal effects, and partly in photonic integrations.

  • 128.
    Qiu, Min
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik, Fotonik. KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Li, Qiang
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik, Fotonik. KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Zhang, Ziyang
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Liu, Fangfei
    Chang, Qingjiang
    Su, Yikai
    Silicon micro-cavities and their system applications2009Ingår i: PHOTONICS PACKAGING, INTEGRATION, AND INTERCONNECTS IX / [ed] Glebov AL; Chen RT, 2009, Vol. 7221Konferensbidrag (Refereegranskat)
    Abstract [en]

    We experimentally demonstrate resonance-splitting and enhanced notch as a result of the mutual mode coupling in silicon ring resonator. Dense wavelength conversions, wavelength multicasting and optical up-converter are demonstrated in the split silicon ring resonator. A temporal differentiator and format conversion from NRZ to AMI are demonstrated utilizing the filtering effect of ring resonator. Photonic phase shifter and delay line are demonstrated utilizing the phase shift of ring resonator.

  • 129.
    Qiu, Min
    et al.
    KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
    Mulot, M.
    Swillo, Marcin
    KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
    Anand, Srinivasan
    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.
    Kamp, M.
    Forchel, A.
    Photonic crystal optical filter based on contra-directional waveguide coupling2003Ingår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 83, nr 25, s. 5121-5123Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Wavelength-selective operation of an optical filter (add/drop) based on a contra-directional photonic crystal waveguide coupler is demonstrated. The waveguides are defined as line defects in a two-dimensional triangular photonic crystal fabricated in an InP/GaInAsP heterostructure. The device is characterized using the end-fire method for the drop functionality. The experimental data are in good agreement with the theoretical results predicted by finite-difference time-domain simulations.

  • 130.
    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 crystals2004Ingår i: Proceedings of SPIE - The International Society for Optical Engineering, 2004, s. 286-295Konferensbidrag (Refereegranskat)
    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.

  • 131.
    Qiu, Min
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Neff, Curtis
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Andersson, L. Mauritz
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Coupled resonator optical waveguides with electromagnetically induced transparent media2006Ingår i: Technical digest: July 23 - 26, 2006, OSA Headquarters, Washington, DC, USA, Optical Society of America, 2006Konferensbidrag (Refereegranskat)
    Abstract [en]

    We numerically demonstrate ultra slow light in a coupled optical resonator waveguide embedded in a highly dispersive medium. This combination dramatically reduces the propagation speed of light pulses in the structure to below 1% c0.

  • 132.
    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 crystals2005Ingår i: SEMICONDUCTOR AND ORGANIC OPTOELECTRONIC MATERIALS AND DEVICES, 2005, Vol. 5624, s. 345-352Konferensbidrag (Refereegranskat)
    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.

  • 133.
    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 region2003Ingår i: IEEE Journal of Selected Topics in Quantum Electronics, ISSN 1077-260X, E-ISSN 1558-4542, Vol. 9, nr 1, s. 106-110Artikel i tidskrift (Refereegranskat)
    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.

  • 134.
    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 crystals2005Ingår i: Applied Physics A: Materials Science & Processing, ISSN 0947-8396, E-ISSN 1432-0630, Vol. 80, nr 6, s. 1231-1236Artikel i tidskrift (Refereegranskat)
    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.

  • 135.
    Qiu, Min
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Xiao, Sanshui
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Optical microcavity based on zero-group-velocity surface modes in photonic crystals - art. no. 6020192005Ingår i: Optoelectronic Materials and Devices for Optical Communications / [ed] Tsuji, S; Buus, J; Luo, Y, BELLINGHAM: SPIE-INT SOC OPTICAL ENGINEERING , 2005, Vol. 6020, s. 2019-2019Konferensbidrag (Refereegranskat)
    Abstract [en]

    Optical microcavities based on zero-aroup-velocity surface modes in photonic crystals are studied. It is shown that high quality factors can be easily for such microcavities in photonic crystals. With increasing of the cavity length, the quality factor is gradually enhanced and the resonant frequency converges to that of the zero-group-velocity surface mode in the photonic crystals. Different with other microcavities mentioned in the literature, microcavities proposed in this paper can be considered as open cavities in the sense that one of the in-plane boundaries is exposed to air.

  • 136.
    Qiu, Min
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Yan, M.
    Yan, Wei
    Transformation optics and invisibility cloaks2008Konferensbidrag (Refereegranskat)
    Abstract [en]

    In this paper, we briefly summarize the theory of transformation optics and introduce its application in achieving perfect invisibility cloaking. In particular, we theoretically show how the task of realizing cylindrical invisibility cloaks can be eased by using either structural approximation or material simplification. The corresponding invisibility performances of the approximate or simplified cylindrical cloaks are presented in detail.

  • 137.
    Qiu, Min
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Yan, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Hao, Jiaming
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Yan, Wei
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Wang, Jing
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Transformation Optics for Designing Superlenses2009Ingår i: ICEAA: 2009 INTERNATIONAL CONFERENCE ON ELECTROMAGNETICS IN ADVANCED APPLICATIONS, NEW YORK: IEEE , 2009, s. 944-947Konferensbidrag (Refereegranskat)
    Abstract [en]

    We show that by using the recently emerged transformation optics, it is possible to design perfect lenses in new geometries with an imaging performance almost equivalent to the well studied perfect slab lens. In addition, the theory of transformation optics generalizes the complementary bilayer lenses to many other material compositions, including cases where passive or active obstacles are involved in the lens system.

  • 138.
    Qiu, Min
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Zhang, Ziyang
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    High-Q microcavities in 2D photonic crystal slabs studied by FDTD techniques and Pade approximation2005Ingår i: Photonic Crystal Materials and Devices III / [ed] Adibi, A; Lin, SY; Scherer, A, BELLINGHAM, WA: SPIE-INT SOC OPTICAL ENGINEERING , 2005, Vol. 5733, s. 366-376Konferensbidrag (Refereegranskat)
    Abstract [en]

    A series of microcavities in 2D hexagonal lattice photonic crystal slabs (PCS's) are studied. A combination of FDTD techniques and Pade approximation with Baker's algorithm is used to accurately determine the resonant frequencies and quality factors of the cavity modes simultaneously. Q factor larger than 10(6) is obtained for a one missing hole cavity. Another cavity with smaller and simpler design keeps Q factor larger than 10(5). Microcavities in silicon-on-insulator-type (SOI-type) PCS's are also Studied. Simulations show that Q factors of cavities in SOI-type PCS's are much smaller than those in the membrane PCS's. Deep etching of air holes is still required to obtain relatively high Q cavities in SOI-type PCS's.

  • 139.
    Ruan, Zhichao
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik (Stängd 20120101).
    Qiu, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik (Stängd 20120101).
    Negative refraction and sub-wavelength imaging through surface waves on periodically structured metal surface2006Konferensbidrag (Refereegranskat)
    Abstract [en]

    The negative refraction of surface waves on a structured metal surface is proposed and demonstrated. Sub-wavelength imaging of a point diploe source through a slab structure is also shown.

  • 140.
    Ruan, Zhichao
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Qiu, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Role of localized waveguide resonances in the enhanced transmission through periodic arrays of subwavelength holes2006Ingår i: Photonic metamaterials, Optical Society of America, 2006Konferensbidrag (Refereegranskat)
    Abstract [en]

    It is shown that the localized waveguide resonance exists in both the perfectly electronic conductivity film and the Au film with subwavelength holes, and plays an important role in the enhanced transmission.

  • 141.
    Ruan, Zhichao
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Qui, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Enhanced Transmission through Periodic Arrays of Subwavelength Holes: The Role of Localized Waveguide Resonances2006Ingår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 96, nr 23, s. 233901-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    By using the rigid full-vectorial three-dimensional finite-difference time-domain method, we show that the enhanced transmission through a metallic film with a periodic array of subwavelength holes results from two different resonances: (i) localized waveguide resonances where each air hole can be considered as a section of metallic waveguide with both ends open to free space, forming a low-quality-factor resonator, and (ii) well-recognized surface plasmon resonances due to the periodicity. These two different resonances can be characterized from electromagnetic band structures in the structured metal film. In addition, we show that the shape effect in the enhanced transmission through the Au film with subwavelength holes is attributed to the localized waveguide resonance.

  • 142.
    Ruan, Zhichao
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Qui, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Negative refraction and sub-wavelength imaging through surface waves on structured perfect conductor surfaces2006Ingår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 14, nr 13, s. 6172-6177Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We report that negative refraction can be achieved through surface waves on a metal surface with an array of drilled holes. Using a rigorous full-vectorial three-dimensional finite-difference time-domain method, we also demonstrate the sub-wavelength imaging of a point dipole source by a slab of such a structure.

  • 143.
    Ruan, Zhichao
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Qui, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Slow electromagnetic wave guided in subwavelength region along one-dimensional periodically structured metal surface2007Ingår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 90, nr 20, s. 201906-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A perfect electric conductor surface with one-dimensional periodic rectangle holes is proposed as a surface-plasmon-like waveguide, where designed surface plasmon modes with very low group velocity are confined in a subwavelength region. It is shown that the half maximum of electric field intensity of the mode can be confined in a 0.20 lambda x0.10 lambda subwavelength region on the transversal plane and the group velocity approaches to zeros, where lambda is the wavelength in vacuum.

  • 144.
    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 refraction2005Ingår i: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 71, nr 4, s. 045111-Artikel i tidskrift (Refereegranskat)
    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.

  • 145.
    Ruan, Zhichao
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Yan, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Neff, Curtis W.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Qiu, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Ideal cylindrical cloak: Perfect but sensitive to tiny perturbations2007Ingår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 99, nr 11Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A cylindrical wave expansion method is developed to obtain the scattering field for an ideal two-dimensional cylindrical invisibility cloak. A near-ideal model of the invisibility cloak is set up to solve the boundary problem at the inner boundary of the cloak shell. We confirm that a cloak with the ideal material parameters is a perfect invisibility cloak by systematically studying the change of the scattering coefficients from the near-ideal case to the ideal one. However, because of the slow convergence of the zeroth-order scattering coefficients, a tiny perturbation on the cloak would induce a noticeable field scattering and penetration.

  • 146. Rung, A.
    et al.
    Ribbing, C. G.
    Qiu, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Gap maps for triangular photonic crystals with a dispersive and absorbing component2005Ingår i: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 72, nr 20Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Some consequences of a strong lattice resonance in the working frequency region of a 2D photonic crystal are investigated. It opens for two kinds of gaps in the dispersion relations: structure gaps and a polaritonic gap. A transverse optical oscillator model for ceramic beryllium oxide has been used to simulate the dielectric function of the polaritonic medium. The effective index of refraction is different on either side of the resonance, which causes BeO to act both as a high index material and a low index material. Gap maps for two kinds of triangular structures were calculated: BeO cylinders in air or in a high-index, nondispersive dielectric. These gap maps show appearance and disappearance of the transverse electric, transverse magnetic, and complete structure gaps as function of the packing fraction r/a, and the lattice constant a. The results illustrate the importance of whether the dielectric or the polaritonic material has the higher effective dielectric function. The effects of absorption, included by the damping parameter of the oscillator model, are briefly discussed.

  • 147.
    Shi, Yuechun
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO. Nanjing Univ, Microwave Photon Technol Lab, Nanjing Natl Lab Microstruct, Peoples R China.
    Chen, Xi
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Lou, Fei
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Chen, Yiting
    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.
    Wosinski, Lech
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Qiu, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO. Zhejiang University, China.
    All-optical switching of silicon disk resonator based on photothermal effect in metal-insulator-metal absorber2014Ingår i: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 39, nr 15, s. 4431-4434Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Efficient narrowband light absorption by a metal-insulator-metal (MIM) structure can lead to high-speed light-to-heat conversion at a micro-or nanoscale. Such a MIM structure can serve as a heater for achieving all-optical light control based on the thermo-optical (TO) effect. Here we experimentally fabricated and characterized a novel all-optical switch based on a silicon microdisk integrated with a MIM light absorber. Direct integration of the absorber on top of the microdisk reduces the thermal capacity of the whole device, leading to high-speed TO switching of the microdisk resonance. The measurement result exhibits a rise time of 2.0 mu s and a fall time of 2.6 mu s with switching power as low as 0.5 mW; the product of switching power and response time is only about 1.3 mW.mu s. Since no auxiliary elements are required for the heater, the switch is structurally compact, and its fabrication is rather easy. The device potentially can be deployed for new kinds of all-optical applications.

  • 148.
    Soltanmoradi, Reyhaneh
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Dyakov, Sergey A.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Wang, Q.
    Qiu, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO. State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, China.
    Yan, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Multi-resonator structure based on continuous silver thin films for transparent conductors2014Ingår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 105, nr 6, s. 061110-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A type of metal-dielectric multilayered structures is investigated theoretically and experimentally for achieving optical transparency with a high electrical conductivity. The structure in our demonstrated case comprises of two coupled metal-dielectric-metal planar optical resonators with metal-layer thicknesses near to its skin depth. Simulations show that the maximum transmittance for visible light can easily reach 90% for silver-based structures. Experimentally, the sample fabricated exhibits a transmission window with a bandwidth of 150 nm and a maximum transmittance of 76% around 643 nm wavelength at normal incidence. Its sheet resistance is measured to be less than 10 Omega/square, much smaller than that of common indium-tin-oxide films. Transparent conductors functioning for blue light and even for the whole visible light are also shown to be theoretically possible. Owing to their simple fabrication procedure as well as design flexibility, such a layered structure can serve as a compelling alternative as transparent conductors for optoelectronic devices, especially for liquid-crystal displays and light-emitting diodes.

  • 149.
    Soltanmoradi, Reyhaneh
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Dyakov, Sergey
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Wang, Qin
    Qiu, Min
    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.
    Double-resonator structure based on continuous silver thin films for transparent conductorsArtikel i tidskrift (Övrigt vetenskapligt)
    Abstract [en]

    A type of metal-dielectric multilayered structures is investigated theoretically and experimentally for achieving relatively wide-band transparency at visible frequencies with high electrical conductivity. The proposed structure comprises of two coupled metal-dielectric-metal planar optical resonators with metal layer thicknesses near to its skin depth. Simulations show that the maximum transmittance for visible light can easily reach 90% for silver-based structures. Experimentally we demonstrate such a sample that exhibits a transmission window with a bandwidth of 150nm and a maximum transmittance of 76% around 643nm wavelength at normal incidence. Its sheet resistance is measured to be less than 10Ω/☐, much smaller than that of common indium-tin-oxide films. Owing to their simple fabrication procedure as well as design flexibility, such a layered structure can serve as a compelling alternative as transparent conductors for optoelectronic devices, especially for liquid-crystal displays and light-emitting diodes.

  • 150.
    Soltanmoradi, Reyhaneh
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Wang, Q.
    Qiu, Min
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Andersson, J. Y.
    Spectral selectivity of subwavelength gold-based photonic crystals on GaAs substrate2013Ingår i: 2013 7th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS), IEEE Computer Society, 2013, s. 100-102Konferensbidrag (Refereegranskat)
    Abstract [en]

    Gold-based subwavelength photonic crystal (PhC) structures on GaAs substrate have been fabricated on a wafer scale. The structures have then been characterized and compared with related simulation results. Integrating these gold-based PhC structures onto III-V semiconductor infrared (IR) photodetectors through a top-down approach has promising potential to enhance detector's performance; especially as its wafer scale fabrication method enables the direct adaption to high volume IR detector processing line.

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