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Publications (10 of 124) Show all publications
Lobov, G. S., Marinins, A., Etcheverry, S., Zhao, Y., Vasileva, E., Sugunan, A., . . . Popov, S. (2017). Direct birefringence and transmission modulation via dynamic alignment of P3HT nanofibers in an advanced opto-fluidic component. Optical Materials Express, 7(1), 52-61
Open this publication in new window or tab >>Direct birefringence and transmission modulation via dynamic alignment of P3HT nanofibers in an advanced opto-fluidic component
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2017 (English)In: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 7, no 1, p. 52-61Article in journal (Refereed) Published
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/mu m. This report describes a technique for light modulation, which can be implemented in optical fiber-based devices or on-chip integrated components.

Place, publisher, year, edition, pages
Optical Society of America, 2017
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-202445 (URN)10.1364/OME.7.000052 (DOI)000392205600007 ()2-s2.0-85008157720 (Scopus ID)
Funder
Swedish Research Council, VR-SRL 2012-4421Swedish Research Council, VR-SRL 2013-6780Swedish Foundation for Strategic Research , EM11-0002
Note

QC 20170306

Available from: 2017-03-06 Created: 2017-03-06 Last updated: 2017-11-29Bibliographically approved
Sun, X., Thylén, L. & Wosinski, L. (2017). Hollow hybrid plasmonic Mach-Zehnder sensor. Optics Letters, 42(4)
Open this publication in new window or tab >>Hollow hybrid plasmonic Mach-Zehnder sensor
2017 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 42, no 4Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
Optical Society of America, 2017
National Category
Nano Technology
Identifiers
urn:nbn:se:kth:diva-205967 (URN)10.1364/OL.42.000807 (DOI)000394039500039 ()2-s2.0-85013477419 (Scopus ID)
Note

QC 20170427

Available from: 2017-04-25 Created: 2017-04-25 Last updated: 2017-04-27Bibliographically approved
Sun, X., Thylén, L. & Wosinski, L. (2017). MEMS Tunable Hybrid Plasmonic-Si Waveguide. In: OSA Technical Digest (online): . Paper presented at Optical Fiber Communication Conference (OFC) (pp. Th2A.6).
Open this publication in new window or tab >>MEMS Tunable Hybrid Plasmonic-Si Waveguide
2017 (English)In: OSA Technical Digest (online), 2017, p. Th2A.6-Conference paper, Published paper (Refereed)
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.

National Category
Nano Technology
Identifiers
urn:nbn:se:kth:diva-205972 (URN)10.1364/OFC.2017.Th2A.6 (DOI)000403405800221 ()2-s2.0-85025584254 (Scopus ID)
Conference
Optical Fiber Communication Conference (OFC)
Note

QC 20170427

Available from: 2017-04-25 Created: 2017-04-25 Last updated: 2017-10-30Bibliographically approved
Sun, X., Thylén, L. & Wosinski, L. (2017). MEMS tunable hybrid Plasmonic-Si waveguide. In: 2017 Optical Fiber Communications Conference and Exhibition, OFC 2017 - Proceedings: . Paper presented at 2017 Optical Fiber Communications Conference and Exhibition, OFC 2017, 19 March 2017 through 23 March 2017. Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>MEMS tunable hybrid Plasmonic-Si waveguide
2017 (English)In: 2017 Optical Fiber Communications Conference and Exhibition, OFC 2017 - Proceedings, Institute of Electrical and Electronics Engineers Inc. , 2017Conference paper (Refereed)
Abstract [en]

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

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2017
Keyword
Optical fibers, Plasmons, Refractive index, Silicon, Waveguides, Effective refractive index, Extinction ratios, MEMS-structure, Off state, Propagation loss, Si-waveguide, Optical fiber communication
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-216485 (URN)2-s2.0-85025584254 (Scopus ID)9781943580231 (ISBN)
Conference
2017 Optical Fiber Communications Conference and Exhibition, OFC 2017, 19 March 2017 through 23 March 2017
Note

Funding text: This work was supported by the Swedish Research Council (VR) through its Linnams Center of Excellence ADOPT. as well as project VR-2015-03793. Xu Sun acknowledges China Scholarship Council (CSC) for the financial support.

QC 20171212

Available from: 2017-12-12 Created: 2017-12-12 Last updated: 2017-12-12Bibliographically approved
Wu, H., Ma, K., Shi, Y., Wosinski, L. & Dai, D. (2017). Ultracompact on-chip photothermal power monitor based on silicon hybrid plasmonic waveguides. Nanophotonics, 6(5), 1121-1131
Open this publication in new window or tab >>Ultracompact on-chip photothermal power monitor based on silicon hybrid plasmonic waveguides
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2017 (English)In: Nanophotonics, ISSN 2192-8614, Vol. 6, no 5, p. 1121-1131Article in journal (Refereed) Published
Abstract [en]

We propose and demonstrate an ultracompact on-chip photothermal power monitor based on a silicon hybrid plasmonic waveguide (HPWG), which consists of a metal strip, a silicon core, and a silicon oxide (SiO2) insulator layer between them. When light injected to an HPWG is absorbed by the metal strip, the temperature increases and the resistance of the metal strip changes accordingly due to the photothermal and thermal resistance effects of the metal. Therefore, the optical power variation can be monitored by measuring the resistance of the metal strip on the HPWG. To obtain the electrical signal for the resistance measurement conveniently, a Wheatstone bridge circuit is monolithically integrated with the HPWG on the same chip. As the HPWG has nanoscale light confinement, the present power monitor is as short as ~3 μm, which is the smallest photothermal power monitor reported until now. The compactness helps to improve the thermal efficiency and the response speed. For the present power monitor fabricated with simple fabrication processes, the measured responsivity is as high as about 17.7 mV/mW at a bias voltage of 2 V and the power dynamic range is as large as 35 dB.

Place, publisher, year, edition, pages
Walter de Gruyter GmbH, 2017
Keyword
Photodetectors, photothermal effects, silicon, surface plasmons, Bridge circuits, Metals, Monitoring, Monolithic integrated circuits, Optical waveguides, Plasmons, Silicon oxides, Waveguides, Fabrication process, Hybrid plasmonic waveguides, Monolithically integrated, Resistance measurement, Temperature increase, Wheatstone bridge circuits, Strip metal
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-216219 (URN)10.1515/nanoph-2016-0169 (DOI)000407233400022 ()2-s2.0-85027327111 (Scopus ID)
Note

QC 20171215

Available from: 2017-12-15 Created: 2017-12-15 Last updated: 2017-12-15Bibliographically approved
Lobov, G., Zhao, Y., Marinins, A., Yan, M., Li, J., Sugunan, A., . . . Popov, S. (2016). Dynamic Manipulation of Optical Anisotropy of Suspended Poly-3-hexylthiophene Nanofibers. Advanced Optical Materials, 4(10), 1651-1656
Open this publication in new window or tab >>Dynamic Manipulation of Optical Anisotropy of Suspended Poly-3-hexylthiophene Nanofibers
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2016 (English)In: Advanced Optical Materials, ISSN 2195-1071, Vol. 4, no 10, p. 1651-1656Article in journal (Refereed) Published
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.​

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2016
Keyword
anisotropic optical materials, electrooptical materials, nanofibers, optical properties, polymers, Anisotropy, Birefringence, Electric fields, Optical anisotropy, Optical fibers, Refractive index, Alternating electric field, Electric birefringence, Electro-optical applications, External electric field, Quadrupole configuration, Semiconducting nanostructures, Transmission ellipsometry
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-195418 (URN)10.1002/adom.201600226 (DOI)2-s2.0-84979574389 (Scopus ID)
Note

QC 20161128

Available from: 2016-11-28 Created: 2016-11-03 Last updated: 2017-12-29Bibliographically approved
Sun, X., Thylén, L. & Wosinski, L. (2016). Hollow Hybrid Plasmonic Waveguide Used for Electro-optic Phase Modulation. In: Optics InfoBase Conference Papers: . Paper presented at Asia Communications and Photonics Conference, ACPC 2016; Wuhan; China; 2 November 2016 through 5 November 2016 (pp. AF3F.2). Optical Society of America
Open this publication in new window or tab >>Hollow Hybrid Plasmonic Waveguide Used for Electro-optic Phase Modulation
2016 (English)In: Optics InfoBase Conference Papers, Optical Society of America, 2016, p. AF3F.2-Conference paper, Published paper (Refereed)
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.

Place, publisher, year, edition, pages
Optical Society of America, 2016
National Category
Nano Technology
Identifiers
urn:nbn:se:kth:diva-205970 (URN)10.1364/ACPC.2016.AF3F.2 (DOI)2-s2.0-85016443527 (Scopus ID)
Conference
Asia Communications and Photonics Conference, ACPC 2016; Wuhan; China; 2 November 2016 through 5 November 2016
Note

QC 20170427

Available from: 2017-04-25 Created: 2017-04-25 Last updated: 2017-11-13Bibliographically approved
Sun, X., Wosinski, L. & Thylén, L. (2016). Nanoscale Surface Plasmon Polariton Disk Resonators, a Theoretical Analysis. IEEE Journal of Selected Topics in Quantum Electronics, 22(2)
Open this publication in new window or tab >>Nanoscale Surface Plasmon Polariton Disk Resonators, a Theoretical Analysis
2016 (English)In: IEEE Journal of Selected Topics in Quantum Electronics, ISSN 1077-260X, E-ISSN 1558-4542, Vol. 22, no 2Article in journal (Refereed) Published
Abstract [en]

We analyze whispering gallery-type disk resonators with radii down to 50 nm. Single interface waveguiding is accomplished by a plasmonic-dielectric interface operating near the surface plasmon polariton (SPP) resonance, employing a hypothetical material with lower loss than what is currently available in metals or negative permittivity media. The disk is immersed in a second dielectric, nonresonant to the plasmonic medium. Due to the high effective index of the disk mode and the concomitant low radiation losses, the quality (Q) values of the resonator are solely determined by material losses, in contrast to more conventional nanoscale resonators. We calculate the dependence of the effective indices of the guided mode, the Q values of absorption and radiation, and the Purcell factor on the deviation from the SPP resonance.

Place, publisher, year, edition, pages
IEEE, 2016
Keyword
Integrated optics, optical resonators, plasmons
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-180910 (URN)10.1109/JSTQE.2015.2479924 (DOI)000364842500001 ()2-s2.0-84946761408 (Scopus ID)
Funder
Swedish Research Council
Note

QC 20160129

Available from: 2016-01-29 Created: 2016-01-25 Last updated: 2017-04-27Bibliographically approved
Sun, X. & Wosinski, L. (2015). Double-slot hybrid plasmonic cavity used for phase modulation and sensing. In: Optical Fiber Communication Conference, OFC 2015: . Paper presented at Optical Fiber Communication Conference, OFC 2015, 22 March 2015 through 26 March 2015. OSA - The Optical Society
Open this publication in new window or tab >>Double-slot hybrid plasmonic cavity used for phase modulation and sensing
2015 (English)In: Optical Fiber Communication Conference, OFC 2015, OSA - The Optical Society , 2015Conference paper, Published paper (Refereed)
Abstract [en]

Highly-efficient double-slot hybrid plasmonic cavity is demonstrated. By measuring phase change with different liquids, we show that this sub-wavelength structure has better modulation efficiency than Si-based one for applications in ultra-compact highly-efficient sensors and modulators.

Place, publisher, year, edition, pages
OSA - The Optical Society, 2015
Keyword
Modulation, Optical communication, Optical fibers, Phase modulation, Plasmons, Modulation efficiency, Phase Change, Si-based, Sub-wavelength structures, Optical fiber communication
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-177234 (URN)000370976400528 ()2-s2.0-84930885133 (Scopus ID)9781557529374 (ISBN)
Conference
Optical Fiber Communication Conference, OFC 2015, 22 March 2015 through 26 March 2015
Note

QC 20151125

Available from: 2015-11-25 Created: 2015-11-17 Last updated: 2016-04-04Bibliographically approved
Lobov, G. S., Zhao, Y., Marinins, A., Yan, M., Li, J., Toprak, M. S., . . . Popov, S. (2015). Electric field induced optical anisotropy of P3HT nanofibers in a liquid solution. Optical Materials Express, 5(11), 2642-2647
Open this publication in new window or tab >>Electric field induced optical anisotropy of P3HT nanofibers in a liquid solution
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2015 (English)In: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 5, no 11, p. 2642-2647Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
Optical Society of America, 2015
Keyword
Anisotropy, Electric fields, Nanofibers, Real time control, Alternating electric field, Anisotropic optical properties, Crystalline structure, Electric field induced, Electrooptical response, Poly-3-hexylthiophene, Spectroscopic measurements, Static electric fields, Optical properties
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-181212 (URN)10.1364/OME.5.002642 (DOI)000364467700027 ()2-s2.0-84947753945 (Scopus ID)
Note

QC 20160210

Available from: 2016-02-10 Created: 2016-01-29 Last updated: 2017-12-29Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-5967-2651

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