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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, 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/μm. This report describes a technique for light modulation, which can be implemented in optical fiber-based devices or on-chip integrated components.

Keywords
Absorption spectroscopy, Aspect ratio, Birefringence, Electric fields, Light modulation, Liquid crystals, Modulation, Nanofibers, Optical fiber fabrication, Optical fibers, Anisotropic absorption, Birefringence property, External electric field, Fiber-based device, High aspect ratio nano-structures, Liquid crystal materials, Poly-3-hexylthiophene, Transmission modulation, Light transmission
National Category
Nano Technology
Identifiers
urn:nbn:se:kth:diva-202242 (URN)10.1364/OME.7.000052 (DOI)000392205600007 ()2-s2.0-85008157720 (Scopus ID)
Note

Funding text: European Union (EU) project ICONE (Grant #608099); Swedish Research Council (VR-SRL 2012-4421, VR-SRL 2013-6780); Swedish Foundation for Strategic Research (SSF, Grant no EM11-0002). The authors acknowledge Prof. Walter Margulis for fruitful discussions regarding optical fiber components and for his assistance in improving the quality of the manuscript. QC 20170320

Available from: 2017-03-20 Created: 2017-03-20 Last updated: 2025-03-06Bibliographically approved
Lobov, G., Marinins, A., Shafagh, R. Z., Zhao, Y., van der Wijngaart, W., Wosinski, L., . . . Popov, S. (2017). Electro-optical effects of high aspect ratio P3HT nanofibers colloid in polymer micro-fluid cells. Optics Letters, 42(11), 2157-2160
Open this publication in new window or tab >>Electro-optical effects of high aspect ratio P3HT nanofibers colloid in polymer micro-fluid cells
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2017 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 42, no 11, p. 2157-2160Article in journal (Refereed) Published
Abstract [en]

This Letter reports the electro-optical (EO) effect of Poly(3-hexylthiophene-2,5-diyl) (P3HT) nanofibers colloid in a polymer micro-fluidic EO cell. P3HT nanofibers are high aspect ratio semiconducting nanostructures, and can be collectively aligned by an external alternating electric field. Optical transmission modulated by the electric field is a manifestation of the electro-optical effect due to high inner crystallinity of P3HT nanofibers. According to our results, the degree of alignment reaches a maximum at 0.6 V/μm of electric field strength, implying a big polarizability value due to geometry and electrical properties of P3HT nanofibers. We believe that one-dimensional crystalline organic nanostructures have a large potential in EO devices due to their significant anisotropy, wide variety of properties, low actuation voltages, and opportunity to be tailored via adjustment of the fabrication process.

Place, publisher, year, edition, pages
OSA Publishing, 2017
Keywords
P3HT, Nanofibers, optofluidics, reaction injectin molding, RIM, OSTE, micro-fluid cells
National Category
Nano Technology
Identifiers
urn:nbn:se:kth:diva-207850 (URN)10.1364/OL.42.002157 (DOI)000403534700027 ()28569870 (PubMedID)2-s2.0-85020417115 (Scopus ID)
Note

QC 20220329

Available from: 2017-05-27 Created: 2017-05-27 Last updated: 2025-03-06Bibliographically approved
Sun, X., Dai, D., Wu, H., Thylén, L. & Wosinski, L. (2017). Highly-efficient graphene-based silicon hybrid plasmonic waveguide modulator. In: Optics InfoBase Conference Papers: . Paper presented at Advanced Photonics, IPRSN 2017, New Orleans, United States, 24 July 2017 through 27 July 2017. Optics Info Base, Optical Society of America, Part F52
Open this publication in new window or tab >>Highly-efficient graphene-based silicon hybrid plasmonic waveguide modulator
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2017 (English)In: Optics InfoBase Conference Papers, Optics Info Base, Optical Society of America, 2017, Vol. Part F52Conference paper, Published paper (Refereed)
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.

Place, publisher, year, edition, pages
Optics Info Base, Optical Society of America, 2017
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:kth:diva-213535 (URN)10.1364/IPRSN.2017.ITu3A.2 (DOI)2-s2.0-85028008679 (Scopus ID)
Conference
Advanced Photonics, IPRSN 2017, New Orleans, United States, 24 July 2017 through 27 July 2017
Note

QC 20170901

Part of ISBN 978-194358030-9

Available from: 2017-09-01 Created: 2017-09-01 Last updated: 2024-11-06Bibliographically 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 ()28198870 (PubMedID)2-s2.0-85013477419 (Scopus ID)
Note

QC 20170427

Available from: 2017-04-25 Created: 2017-04-25 Last updated: 2025-03-06Bibliographically approved
Thylén, L., Wosinski, L., Sun, X. & Dai, D. (2017). Integrated nanophotonics for information technologies and sensors: Ways to solve the present gridlock in performance. In: 2017 19th International Conference on Transparent Optical Networks (ICTON): . Paper presented at 19th International Conference on Transparent Optical Networks, ICTON 2017, Girona, Catalonia, Spain, 2 July 2017 through 6 July 2017. IEEE Computer Society, Article ID 8024858.
Open this publication in new window or tab >>Integrated nanophotonics for information technologies and sensors: Ways to solve the present gridlock in performance
2017 (English)In: 2017 19th International Conference on Transparent Optical Networks (ICTON), IEEE Computer Society, 2017, article id 8024858Conference paper, Published paper (Refereed)
Abstract [en]

The decades long development in shrinking footprint and improving performance of photonics integrated circuits has seemingly slowed down in recent years, posing problems in e g interconnects in data centers with their ever increasing power requirements. Thus, routes to a continued development towards smaller footprint, lower power, higher performance integrated nanophotonics will be presented and discussed. Comparison to some nanoelectronics devices will be made.

Place, publisher, year, edition, pages
IEEE Computer Society, 2017
Keywords
integrated photonics, nanophotonics, optical communications, optical sensors
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-223027 (URN)10.1109/ICTON.2017.8024858 (DOI)000427031500133 ()2-s2.0-85031009362 (Scopus ID)9781538608586 (ISBN)
Conference
19th International Conference on Transparent Optical Networks, ICTON 2017, Girona, Catalonia, Spain, 2 July 2017 through 6 July 2017
Note

QC 20180221

Available from: 2018-02-21 Created: 2018-02-21 Last updated: 2025-03-06Bibliographically 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: 2025-03-06Bibliographically approved
Wosinski, L., Sun, X. & Thylén, L. (2017). Nanophotonics and hybrid plasmonics: Different technologies and applications. In: Integrated Optics: Physics and Simulations III. Paper presented at Integrated Optics: Physics and Simulations III 2017, Prague, Czech Republic, 24 April 2017 through 25 April 2017. SPIE - The International Society for Optics and Photonics, 10242, Article ID 1024202.
Open this publication in new window or tab >>Nanophotonics and hybrid plasmonics: Different technologies and applications
2017 (English)In: Integrated Optics: Physics and Simulations III, SPIE - The International Society for Optics and Photonics, 2017, Vol. 10242, article id 1024202Conference paper, Published paper (Refereed)
Abstract [en]

This paper gives a review of the recent progresses in our research on nanophotonics and hybrid plasmonic geometries, structures and devices. In the first part we present SOI-nanowire-based integrated components. The concept and different configurations of hybrid plasmonic structures will be then discussed. Finally different fabricated devices for applications in optical interconnects and sensing will be presented and characterized.

Place, publisher, year, edition, pages
SPIE - The International Society for Optics and Photonics, 2017
Series
Proceedings of SPIE - The International Society for Optical Engineering, ISSN 0277-786X ; 10242
Keywords
hybrid plasmonic devices, integrated optical devices, nanophotonics for sensing, optical computer interconnects, plasmonic waveguiding, silicon nanophotonics, Subwavelength structures
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:kth:diva-211855 (URN)10.1117/12.2268555 (DOI)000407285300001 ()2-s2.0-85025677118 (Scopus ID)
Conference
Integrated Optics: Physics and Simulations III 2017, Prague, Czech Republic, 24 April 2017 through 25 April 2017
Note

QC 20170815

Part of ISBN 978-151060985-3

Available from: 2017-08-15 Created: 2017-08-15 Last updated: 2024-11-06Bibliographically 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
Keywords
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: 2022-06-26Bibliographically approved
Sun, X., Chen, X., Yan, M., Qiu, M., Thylen, L. & Wosinski, L. (2016). All-Optical Switching Using a Hybrid Plasmonic Donut Resonator With Photothermal Absorber. IEEE Photonics Technology Letters, 28(15), 1609-1612
Open this publication in new window or tab >>All-Optical Switching Using a Hybrid Plasmonic Donut Resonator With Photothermal Absorber
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2016 (English)In: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 28, no 15, p. 1609-1612Article in journal (Refereed) Published
Abstract [en]

A novel hybrid plasmonic (HP) donut resonator integrated with a photothermal plasmonic absorber has been developed, which can be used as a compact all-optical switch or modulator. The radius of the fabricated HP donut resonator is 1.8 mu m, with a resonant wavelength around 1550 nm and a quality factor (Q factor) around 600. The photothermal plasmonic absorber is directly integrated above the HP device, which can absorb as much as 75% of impinging optical power at 1064 nm wavelength. Since the absorber is in tight contact to the Si ridge of the HP waveguide, the absorbed optical power can efficiently heat up the Si ridge, and hence change the resonant wavelength of the HP donut resonator by Si thermal expansion effect. Experimental results show that the power used for 15 dB amplitude switch is only 10 mW, with rise and fall response times around 18 and 14 mu s, respectively.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2016
Keywords
Integrated optics, plasmons, optical resonators
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-190645 (URN)10.1109/LPT.2016.2558478 (DOI)000379753400002 ()2-s2.0-84973862284 (Scopus ID)
Note

QC 20160818

Available from: 2016-08-18 Created: 2016-08-12 Last updated: 2024-03-15Bibliographically 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
Keywords
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)000386356900026 ()2-s2.0-84979574389 (Scopus ID)
Note

QC 20161128

Available from: 2016-11-28 Created: 2016-11-03 Last updated: 2025-03-06Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-5967-2651

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