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Publications (10 of 66) Show all publications
Ottonello Briano, F., Errando-Herranz, C., Rödjegård, H., Martin, H., Sohlström, H. & Gylfason, K. (2019). Carbon Dioxide Sensing with Low-confinement High-sensitivity Mid-IR Silicon Waveguides. In: 2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO): . Paper presented at Conference on Lasers and Electro-Optics (CLEO), MAY 05-10, 2019, San Jose, CA. IEEE
Open this publication in new window or tab >>Carbon Dioxide Sensing with Low-confinement High-sensitivity Mid-IR Silicon Waveguides
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2019 (English)In: 2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), IEEE , 2019Conference paper, Published paper (Refereed)
Abstract [en]

We present a low-confinement Si waveguide for 4.26 mu m wavelength and apply it to sense CO2 concentrations down to 0.1 %. We demonstrate the highest reported waveguide sensitivity to CO2. 44% of the free-space sensitivity.

Place, publisher, year, edition, pages
IEEE, 2019
Series
Conference on Lasers and Electro-Optics, ISSN 2160-9020
Keywords
mid-infrared, mid-IR, photonics, silicon photonics, gas sensing, optical sensing, optical gas sensing, absorption, carbon dioxide, CO2, CO2 sensing, trace gas, waveguide, photonic waveguide, silicon, microfabrication, microsystems, microtechnology, nanotechnology
National Category
Other Engineering and Technologies Nano Technology Other Electrical Engineering, Electronic Engineering, Information Engineering Analytical Chemistry Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-259471 (URN)10.23919/CLEO.2019.8750210 (DOI)000482226302159 ()2-s2.0-85069147415 (Scopus ID)978-1-943580-57-6 (ISBN)
Conference
Conference on Lasers and Electro-Optics (CLEO), MAY 05-10, 2019, San Jose, CA
Note

QC 20190917

Available from: 2019-09-17 Created: 2019-09-17 Last updated: 2019-10-03
Ottonello Briano, F., Sohlström, H., Forsberg, F., Renoux, P., Ingvarsson, S., Stemme, G. & Gylfason, K. B. (2016). A sub-μs thermal time constant electrically driven Pt nanoheater: thermo-dynamic design and frequency characterization. Applied Physics Letters, 108(19), Article ID 193106.
Open this publication in new window or tab >>A sub-μs thermal time constant electrically driven Pt nanoheater: thermo-dynamic design and frequency characterization
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2016 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 108, no 19, article id 193106Article in journal (Refereed) Published
Abstract [en]

Metal nanowires can emit coherent polarized thermal radiation, work as uncooled bolometers, and provide localized heating. In this paper, we engineer the temperature dynamics of electrically driven Pt nanoheaters on a silicon-on-insulator substrate. We present three designs and we electrically characterize and model their thermal impedance in the frequency range from 3 Hz to 3 MHz. Finally, we show a temperature modulation of 300 K while consuming less than 5 mW of power, up to a frequency of 1.3 MHz. This result can lead to significant advancements in thermography and absorption spectroscopy.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2016
Keywords
nanowire, thermal source, 3 omega method, high frequency
National Category
Nano Technology
Research subject
Electrical Engineering; Materials Science and Engineering; Physics
Identifiers
urn:nbn:se:kth:diva-186289 (URN)10.1063/1.4948979 (DOI)000377023500046 ()2-s2.0-84969524604 (Scopus ID)
Funder
VINNOVA, 2012-01233VINNOVA, 2014-05246Stockholm County Council, 20140751Stockholm County Council, 20150910EU, FP7, Seventh Framework Programme, 267528
Note

QC 20160523

Available from: 2016-05-09 Created: 2016-05-09 Last updated: 2019-10-03Bibliographically approved
Aparicio, F. J., Alcaire, M., Gonzalez-Elipe, A. R., Barranco, A., Holgado, M., Casquel, R., . . . Niklaus, F. (2016). Dye-based photonic sensing systems. Sensors and actuators. B, Chemical, 228, 649-657
Open this publication in new window or tab >>Dye-based photonic sensing systems
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2016 (English)In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 228, p. 649-657Article in journal (Refereed) Published
Abstract [en]

We report on dye-based photonic sensing systems which are fabricated and packaged at wafer scale. For the first time luminescent organic nanocomposite thin-films deposited by plasma technology are integrated in photonic sensing systems as active sensing elements. The realized dye-based photonic sensors include an environmental NO2 sensor and a sunlight ultraviolet light (UV) A+B sensor. The luminescent signal from the nanocomposite thin-films responds to changes in the environment and is selectively filtered by a photonic structure consisting of a Fabry-Perot cavity. The sensors are fabricated and packaged at wafer-scale, which makes the technology viable for volume manufacturing. Prototype photonic sensor systems have been tested in real-world scenarios. (C) 2016 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
Elsevier, 2016
Keywords
Photonic sensor, Dye thin films, Gas sensor, UV sensor, Room-temperature Wafer level packaging
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-184945 (URN)10.1016/j.snb.2016.01.092 (DOI)000371027900081 ()2-s2.0-84956976107 (Scopus ID)
Note

QC 20160410

Available from: 2016-04-10 Created: 2016-04-07 Last updated: 2017-11-30Bibliographically approved
Ottonello Briano, F., Renoux, P., Forsberg, F., Sohlström, H., Ingvarsson, S., Stemme, G. & Gylfason, K. B. (2014). High-frequency sub-wavelength IR thermal source. Paper presented at Silicon Photonics and Photonic Integrated Circuits IV; Brussels; Belgium; 14 April 2014 through 17 April 2014. Proceedings of SPIE, the International Society for Optical Engineering, 9133, 91331D-1-91331D-6
Open this publication in new window or tab >>High-frequency sub-wavelength IR thermal source
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2014 (English)In: Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X, E-ISSN 1996-756X, Vol. 9133, p. 91331D-1-91331D-6Article in journal (Refereed) Published
Abstract [en]

We present a method to characterize the temperature dynamics of miniaturized thermal IR sources. The method circumvents the limitations of current IR photodetectors, by relying only on an electrical measurement rather than on optical detection. Thus, it enables the characterization of the light emission of IR sources over their full operation frequency range. Moreover, we develop a model of thermal IR sources allowing simulations of their thermal and electrical behavior. By combining measurements and modeling, we achieve a comprehensive characterization of a Pt nanowire IR source: the reference resistance R-0 = 17.7 Omega, the TCR alpha = 2.0 x 10(-3) K-1, the thermal mass C = 2.7 x 10(-14) J/K, and the thermal conductance G = 1.3 x 10(-6) W/K. The thermal time constant could not be measured, because of the frequency limitation of our setup. However, the operation of the source has been tested and proved to function up to 1 MHz, indicating that the thermal time constant of the source is smaller than 1 mu s.

Keywords
IR source, platinum nanowire, frequency response
National Category
Nano Technology
Identifiers
urn:nbn:se:kth:diva-144851 (URN)10.1117/12.2052457 (DOI)000338590400031 ()2-s2.0-84903166156 (Scopus ID)
Conference
Silicon Photonics and Photonic Integrated Circuits IV; Brussels; Belgium; 14 April 2014 through 17 April 2014
Projects
GASENS
Funder
Vinnova, 2012-01233
Note

QC 20140813

Available from: 2014-05-26 Created: 2014-04-29 Last updated: 2017-12-05Bibliographically approved
Lapisa, M., Antelius, M., Tocchio, A., Sohlström, H., Stemme, G. & Niklaus, F. (2013). Wafer-Level capping and sealing of heat sensitive substances and liquids with gold gaskets. Sensors and Actuators A-Physical, 201, 154-163
Open this publication in new window or tab >>Wafer-Level capping and sealing of heat sensitive substances and liquids with gold gaskets
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2013 (English)In: Sensors and Actuators A-Physical, ISSN 0924-4247, E-ISSN 1873-3069, Vol. 201, p. 154-163Article in journal (Refereed) Published
Abstract [en]

This paper reports on a novel wafer-level packaging method employing gold gaskets and an epoxy underfill. The packaging is done at room-temperature and atmospheric pressure. The mild packaging conditions allow the encapsulation of sensitive devices. The method is demonstrated for two applications; the wafer-level encapsulation of a liquid and the wafer-level packaging of a photonic gas sensor containing heat sensitive dye-films.

Place, publisher, year, edition, pages
Elsevier, 2013
Keywords
Wafer-level packaging, Liquid sealing, Room-temperature, Underfill application, Gasket
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-119838 (URN)10.1016/j.sna.2013.07.007 (DOI)000325836400020 ()2-s2.0-84881511190 (Scopus ID)
Projects
Phodye
Funder
EU, European Research Council
Note

QC 20131129

Available from: 2013-03-24 Created: 2013-03-24 Last updated: 2017-12-06Bibliographically approved
Dubois, V. J., Antelius, M., Sohlström, H. & Gylfason, K. B. (2012). A single-lithography SOI rib waveguide sensing circuit with apodized low back-reflection surface grating fiber coupling. In: Laurent Vivien, Seppo K. Honkanen, Lorenzo Pavesi, Stefano Pelli (Ed.), SILICON PHOTONICS AND PHOTONIC INTEGRATED CIRCUITS III: . Paper presented at SPIE Photonics Europe, Brussels, April 16-19, 2012 (pp. 84311-84311). SPIE - International Society for Optical Engineering, 8431
Open this publication in new window or tab >>A single-lithography SOI rib waveguide sensing circuit with apodized low back-reflection surface grating fiber coupling
2012 (English)In: SILICON PHOTONICS AND PHOTONIC INTEGRATED CIRCUITS III / [ed] Laurent Vivien, Seppo K. Honkanen, Lorenzo Pavesi, Stefano Pelli, SPIE - International Society for Optical Engineering, 2012, Vol. 8431, p. 84311-84311Conference paper, Published paper (Refereed)
Abstract [en]

We present a single-lithography Mach-Zehnder interferometer sensor circuit, with integrated low back-reflection input and output grating couplers. The low back-reflection is accomplished by a duty cycle apodization optimized for coupling light between single-mode silica fibers and the nanometric silicon-on-insulator (SOI) rib-waveguides. We discuss the design, fabrication, and characterization of the circuit. The apodization profile of the gratings is algorithmically generated using eigenmode expansion based simulations and the integrated waveguides, splitters, and combiners are designed using finite element simulations. The maximum simulated coupling efficiencies of the gratings are 70% and the multimode interference splitters and combiners have a footprint of only 19.2ᅵ4.5 ᅵm2. The devices are fabricated on an SOI wafer with a 220 nmdevice layer and 2 ᅵm buried oxide, by a single electron beam lithography and plasma etching. We characterize the devices in the wavelength range from 1460-1580 nm and show a grating pass-band ripple of only 0.06 dB and grating coupling efficiency of 40% at 1530 nm. The integrated Mach-Zehnder interferometer has an extinction ratio of -18 dB at 1530 nm and between -13 and -19 dB over the whole 1460-1580 nm range.

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2012
Series
Proceedings of SPIE, ISSN 0277-786X ; 8431
Keywords
Integrated Mach-Zehnder interferometer, SOI rib waveguide, single-mode criteria, apodized surfacegrating coupler, multimode interference coupler
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-95291 (URN)10.1117/12.921815 (DOI)000305452700040 ()2-s2.0-84861984786 (Scopus ID)978-0-8194-9123-7 (ISBN)
Conference
SPIE Photonics Europe, Brussels, April 16-19, 2012
Projects
Cell-Ring
Funder
Swedish Research Council, B0460801
Note

QC 20120612

Available from: 2012-06-12 Created: 2012-05-21 Last updated: 2013-09-16Bibliographically approved
Antelius, M., Gylfason, K. B. & Sohlström, H. (2012). An apodized surface grating coupler enabling single lithography silicon photonic nanowire sensors. In: : . Paper presented at Micronano System Workshop, MSW 2012, Linköping, May 9-10.
Open this publication in new window or tab >>An apodized surface grating coupler enabling single lithography silicon photonic nanowire sensors
2012 (English)Conference paper, Poster (with or without abstract) (Other academic)
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-117910 (URN)
Conference
Micronano System Workshop, MSW 2012, Linköping, May 9-10
Note

QC 20130521

Available from: 2013-02-07 Created: 2013-02-07 Last updated: 2013-05-21Bibliographically approved
Bengtsson, M., Lilliesköld, J., Norgren, M., Skog, I. & Sohlström, H. (2012). Developing and Implementing a Program Interfacing Project Course in Electrical Engineering. In: : . Paper presented at 8th International CDIO Conference,Brisbane, Australia July 1-4, 2012.
Open this publication in new window or tab >>Developing and Implementing a Program Interfacing Project Course in Electrical Engineering
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2012 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

In this paper, we describe the ideas behind a second-year Design-Build course in Electrical Engineering. Electrical Engineering is a theoretical subject, and in such it is difficult to maintain the theoretical level in project courses introduced too early in the program, especially when core subjects like electromagnetic field theory are involved. This issue is addressed and we also describe our approach for the assessment of the students. We also discuss the different goals that were set up prior to the course from a program perspective; how we reasoned when designing the course, the assessment structure, and the output once the course was implemented

Keywords
Project course, Design-Build, Electrical Engineering
National Category
Engineering and Technology Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-164513 (URN)
Conference
8th International CDIO Conference,Brisbane, Australia July 1-4, 2012
Note

QC 20150417

Available from: 2015-04-17 Created: 2015-04-17 Last updated: 2015-04-17Bibliographically approved
Gylfason, K. B., Mola Romero, A. & Sohlström, H. (2012). Reducing the temperature sensitivity of SOI waveguide-based biosensors. In: Vivien, L; Honkanen, SK; Pavesi, L; Pelli, S (Ed.), Silicon Photonics and Photonic Integrated Circuits III: . Paper presented at SPIE Photonics Europe, Brussels, April 16-19, 2012 (pp. 84310-84310). SPIE - International Society for Optical Engineering, 8431
Open this publication in new window or tab >>Reducing the temperature sensitivity of SOI waveguide-based biosensors
2012 (English)In: Silicon Photonics and Photonic Integrated Circuits III / [ed] Vivien, L; Honkanen, SK; Pavesi, L; Pelli, S, SPIE - International Society for Optical Engineering, 2012, Vol. 8431, p. 84310-84310Conference paper, Published paper (Refereed)
Abstract [en]

Label-free photonic biosensors fabricated on silicon-on-insulator (SOI) can provide compact size, high evanescent field strength at the silicon waveguide surface, and volume fabrication potential. However, due to the large thermo optic coefficient of water-based biosamples, the sensors are temperature-sensitive. Consequently, active temperature control is usually used. However, for low cost applications, active temperature control is often not feasible. Here, we use the opposite polarity of the thermo-optic coefficients of silicon and water to demonstrate a photonic slot waveguide with a distribution of power between sample and silicon that aims to give athermal operation in water. Based on simulations, we made three waveguide designs close to the athermal point, and asymmetric integrated Mach- Zehnder interferometers for their characterization. The devices were fabricated on SOI with a 220 nm device layer and 2 ï¿œm buried oxide, by electron beam lithography of hydrogen silsesquioxane (HSQ) resist, and etching in a Cl2/HBr/O2/He plasma. With Cargile 50350 fused silica matching oil as top cladding, the group index of the three guides varies from 1.9 to 2.8 at 1550 nm. The temperature sensitivity of the devices varied from -70 to -160 pm/K under the same conditions. A temperature sensitivity of -2 pm/K is projected with water as top cladding.

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2012
Series
Proceedings of SPIE, ISSN 0277-786X ; 8431
Keywords
Slot waveguide, biosensor, athermal, temperature sensitivity
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-95292 (URN)10.1117/12.922263 (DOI)000305452700008 ()2-s2.0-84861987338 (Scopus ID)978-0-8194-9123-7 (ISBN)
Conference
SPIE Photonics Europe, Brussels, April 16-19, 2012
Funder
Swedish Research Council, B0460801
Note

QC 20120613

Available from: 2012-06-13 Created: 2012-05-21 Last updated: 2013-09-16Bibliographically approved
Antelius, M., Gylfason, K. B. & Sohlström, H. (2011). An apodized SOI waveguide-to-fiber surface grating coupler for single lithography silicon photonics. Optics Express, 19(4), 3592-3598
Open this publication in new window or tab >>An apodized SOI waveguide-to-fiber surface grating coupler for single lithography silicon photonics
2011 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 19, no 4, p. 3592-3598Article in journal (Refereed) Published
Abstract [en]

We present the design, fabrication, and characterization of a grating for coupling between a single mode silica fiber and the TE mode in a silicon photonic waveguide on a silicon on insulator (SOI) substrate. The grating is etched completely through the silicon device layer, thus permitting the fabrication of through-etched surface coupled silicon nanophotonic circuits in a single lithography step. Furthermore, the grating is apodized to match the diffracted wave to the mode profile of the fiber. We experimentally demonstrate a coupling efficiency of 35% with a 1 dB bandwidth of 47 nm at 1536 nm on a standard SOI substrate. Furthermore, we show by simulation that with an optimized buried oxide thickness, a coupling efficiency of 72% and a 1 dB bandwidth of 38 nm at 1550 nm is achievable. This is, to our knowledge, the highest simulated coupling efficiency for single-etch TE-mode grating couplers. In particular, simulations show that apodizing a conventional periodic through-etched grating decreases the back-reflection into the waveguide from 21% to 0.1%.

Keywords
1550 nm, Apodizing, Buried oxide thickness, Coupling efficiency, Diffracted waves, Etched gratings, Etched surface, Fiber surface, Grating couplers, Mode profiles, Nanophotonic circuits, Silica fibers, Silicon devices, Silicon photonics, Silicon-on-insulator substrates, Single mode, SOI substrates, SOI waveguides, TE mode, Coupled circuits, Lithography, Nanophotonics, Photonic devices, Silica
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-32605 (URN)10.1364/OE.19.003592 (DOI)000288860000078 ()2-s2.0-79951642749 (Scopus ID)
Note
QC 20110419Available from: 2011-04-19 Created: 2011-04-18 Last updated: 2017-12-11Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-2650-0121

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