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Publications (10 of 13) Show all publications
Drozdz, P., Campion, J., Anoshkin, I., Xenidis, N., Oberhammer, J. & Lioubtchenko, D. V. (2021). W-band waveguide embedded nanofiber absorber. In: 2021 46Th International Conference On Infrared, Millimeter And Terahertz Waves (IRMMW-THZ): . Paper presented at 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz), AUG 30-SEP 03, 2021, ELECTR NETWORK. Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>W-band waveguide embedded nanofiber absorber
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2021 (English)In: 2021 46Th International Conference On Infrared, Millimeter And Terahertz Waves (IRMMW-THZ), Institute of Electrical and Electronics Engineers (IEEE) , 2021Conference paper, Published paper (Refereed)
Abstract [en]

A novel type of absorber integrate into a standard WR-10 metal waveguide of is developed and measured. The absorber is based on alumina nanofibers covered with single or multi- carbon layers. Employing this technique for the CNT based absorbers offers a material with micron scales-oriented 3D microstructures, that is hybrid alumina nanofibers covered with carbon layer. These microstructures result in a low level of reflectance and good absorbance at 75-110 GHz frequency band due to the highly porous and low conductivity.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2021
Series
International Conference on Infrared Millimeter and Terahertz Waves, ISSN 2162-2027
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Atom and Molecular Physics and Optics Communication Systems
Identifiers
urn:nbn:se:kth:diva-313038 (URN)10.1109/IRMMW-THz50926.2021.9567504 (DOI)000782468300621 ()2-s2.0-85125344892 (Scopus ID)
Conference
46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz), AUG 30-SEP 03, 2021, ELECTR NETWORK
Note

Part of proceedings: ISBN 978-1-7281-9424-0

QC 20220531

Available from: 2022-05-31 Created: 2022-05-31 Last updated: 2024-03-18Bibliographically approved
Smirnov, S., Anoshkin, I. V., Generalov, A., Lioubtchenko, D. & Oberhammer, J. (2019). Wavelength-dependent photoconductivity of single-walled carbon nanotube layers. RSC Advances, 9(26), 14677-14682
Open this publication in new window or tab >>Wavelength-dependent photoconductivity of single-walled carbon nanotube layers
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2019 (English)In: RSC Advances, E-ISSN 2046-2069, Vol. 9, no 26, p. 14677-14682Article in journal (Refereed) Published
Abstract [en]

A number of electronic devices such as phase shifters, polarizers, modulators, and power splitters are based on tunable materials. These materials often do not meet all the requirements namely low losses, fast response time, and technological compatibility. Novel nanomaterials, such as single-walled carbon nanotubes, are therefore widely studied to fill this technological gap. Here we show how the dielectric constant of single-walled carbon nanotube layers can be substantially modified by illuminating them due to unique light–matter interactions. We relate the optical excitation of the nanotube layers to the illumination wavelength and intensity, by resistance and capacitance measurements. The dielectric constant is modified under laser illumination due to the change of material polarization and free carrier generation, and is shown to not be temperature-related. The findings indicate that SWCNT layers are a prospective tunable optoelectronic material for both high and low frequency applications.

Place, publisher, year, edition, pages
RSC Publishing, 2019
National Category
Nano Technology
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-251605 (URN)10.1039/C9RA01467E (DOI)000468641300013 ()35516325 (PubMedID)2-s2.0-85065863568 (Scopus ID)
Funder
EU, Horizon 2020, 675683EU, Horizon 2020, 616846
Note

QC 20190515

Available from: 2019-05-15 Created: 2019-05-15 Last updated: 2024-03-18Bibliographically approved
Smirnov, S., Anoshkin, I. V., Lioubtchenko, D. & Oberhammer, J. (2018). Carbon Nanotube Layer Modeling for Computer Simulation of Optically Controlled Phase Shifters. In: : . Paper presented at 2018 48th European Microwave Conference (EuMC) (pp. 827-830). IEEE
Open this publication in new window or tab >>Carbon Nanotube Layer Modeling for Computer Simulation of Optically Controlled Phase Shifters
2018 (English)Conference paper, Published paper (Refereed)
Abstract [en]

We propose an approach for efficient modeling of thin carbon nanotube layers for full-wave device simulations without increasing the number of simulation mesh cells. A surface impedance, used in computer simulations, is calculated from the dielectric constant of the material. The dielectric constant is modeled by a Drude–Lorentz resonance, fitted to experimental results. The approach allowed to study the nanotube-induced losses and finite-size resonance effects in optically-controlled, dielectric rod waveguide-based phase shifters. The correctness of the model was verified both by the simulated and the measured S-parameters in the W-band.

Place, publisher, year, edition, pages
IEEE, 2018
Keywords
carbon nanotubes, millimeter waves, numerical simulation, optically controlled phase shifter, surface impedance
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-239891 (URN)10.23919/EuMC.2018.8541431 (DOI)000503067800191 ()2-s2.0-85059822552 (Scopus ID)978-2-87487-051-4 (ISBN)978-2-87487-050-7 (ISBN)978-1-5386-5285-5 (ISBN)
Conference
2018 48th European Microwave Conference (EuMC)
Funder
EU, Horizon 2020, 675683EU, Horizon 2020, 616846
Note

QC 20181211

Available from: 2018-12-04 Created: 2018-12-04 Last updated: 2022-06-26Bibliographically approved
Anoshkin, I. V., Campion, J., Lioubtchenko, D. V. & Oberhammer, J. (2018). Freeze-Dried Carbon Nanotube Aerogels for High-Frequency Absorber Applications. ACS Applied Materials and Interfaces, 10(23), 19806-19811
Open this publication in new window or tab >>Freeze-Dried Carbon Nanotube Aerogels for High-Frequency Absorber Applications
2018 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, ISSN 1944-8244, Vol. 10, no 23, p. 19806-19811Article in journal (Refereed) Published
Abstract [en]

A novel technique for millimeter wave absorber material embedded in a metal waveguide is proposed. The absorber material is a highly porous carbon nanotube (CNT) aerogel prepared by a freeze-drying technique. CNT aerogel structures are shown to be good absorbers with a low reflection coefficient, less than -12 dB at 95 GHz. The reflection coefficient of the novel absorber is 3-4 times lower than that of commercial absorbers with identical geometry. Samples prepared by freeze-drying at -25 degrees C demonstrate resonance behavior, while those prepared at liquid nitrogen temperature (-196 degrees C) exhibit a significant decrease in reflection coefficient, with no resonant behavior. CNT absorbers of identical volume based on wet-phase drying preparation show significantly worse performance than the CNT aerogel absorbers prepared by freeze-drying. Treatment of the freeze-dried CNT aerogel with n- and p-dopants (monoethanolamine and iodine vapors, respectively) shows remarkable improvement in the performance of the waveguide embedded absorbers, reducing the reflection coefficient by 2 dB across the band.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
Keywords
carbon nanotubes; freeze-drying; millimeter wave absorbers; reflectivity; waveguide loads
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-233878 (URN)10.1021/acsami.8b03983 (DOI)000435525100057 ()29787673 (PubMedID)2-s2.0-85047536864 (Scopus ID)
Note

QC 20180904

Available from: 2018-08-31 Created: 2018-08-31 Last updated: 2022-06-26Bibliographically approved
Demchenko, P., Gomon, D., Anoshkin, I. V., Lioubtchenko, D. & Khodzitsky, M. (2018). Influence of optical pumping on properties of carbon nanotubes with different geometric parameters in THz frequency range. In: 2018 43RD INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ): . Paper presented at 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), SEP 09-14, 2018, Nagoya, JAPAN. IEEE
Open this publication in new window or tab >>Influence of optical pumping on properties of carbon nanotubes with different geometric parameters in THz frequency range
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2018 (English)In: 2018 43RD INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ), IEEE , 2018Conference paper, Published paper (Refereed)
Abstract [en]

Impact of infrared radiation illumination (980 nm) on the properties of cabon nanotubes (CNT), such as complex conductivity and permittivity, with different geometric parameters (lengths, diameters and with presence/absence graphene oxide layer) in the frequency range of 0.2-1.0 THz was studied.

Place, publisher, year, edition, pages
IEEE, 2018
Series
International Conference on Infrared Millimeter and Terahertz Waves, ISSN 2162-2027
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-239858 (URN)10.1109/IRMMW-THz.2018.8509849 (DOI)000449683700011 ()2-s2.0-85056835404 (Scopus ID)978-1-5386-3809-5 (ISBN)
Conference
43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), SEP 09-14, 2018, Nagoya, JAPAN
Note

QC 20181214

Available from: 2018-12-14 Created: 2018-12-14 Last updated: 2022-06-26Bibliographically approved
Lyubchenko, D., Smirnov, S., Anoshkin, I. V. & Oberhammer, J. (2018). Millimeter Wave Beam Steering Based on Optically Controlled Carbon Nanotube Layers. In: : . Paper presented at 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). IEEE
Open this publication in new window or tab >>Millimeter Wave Beam Steering Based on Optically Controlled Carbon Nanotube Layers
2018 (English)Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, the dielectric constant changing of thin carbon nanotube layers under light illumination was used for phase shifter development in dielectric rod waveguides. This designed phase shifter was introduced to the dielectric rod waveguide dual-antenna array. The measurements of the beam steering at 90 GHz of the dielectric rod antenna array, covered with carbon nanotubes, were carried out.

Place, publisher, year, edition, pages
IEEE, 2018
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-239013 (URN)10.1109/IRMMW-THz.2018.8510022 (DOI)000449683700183 ()2-s2.0-85056895310 (Scopus ID)978-1-5386-3809-5 (ISBN)
Conference
2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)
Funder
EU, Horizon 2020, 675683EU, Horizon 2020, 616846
Note

QC 20181119

Available from: 2018-11-14 Created: 2018-11-14 Last updated: 2022-06-26Bibliographically approved
Smirnov, S., Anoshkin, I. V., Lioubtchenko, D. & Oberhammer, J. (2018). Millimeter Wave Phase Shifter Based on Optically Controlled Carbon Nanotube Layers. In: : . Paper presented at 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). IEEE
Open this publication in new window or tab >>Millimeter Wave Phase Shifter Based on Optically Controlled Carbon Nanotube Layers
2018 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Surfaces with tunable impedance are usually lossy at high frequencies, which limits the design of millimeter wave and Terahertz devices. This work experimentally demonstrates a phase shifter based on single-walled carbon nanotubes and dielectric rod waveguides in the 220–330 GHz frequency range. Thin carbon nanotube layers are used as a tunable impedance surface with the dielectric properties optically controlled by laser illumination.

Place, publisher, year, edition, pages
IEEE, 2018
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-239014 (URN)10.1109/IRMMW-THz.2018.8510053 (DOI)000449683700211 ()2-s2.0-85056810920 (Scopus ID)978-1-5386-3809-5 (ISBN)
Conference
2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)
Funder
EU, Horizon 2020, 675683EU, Horizon 2020, 616846.
Note

QC 20181119

Available from: 2018-11-14 Created: 2018-11-14 Last updated: 2022-06-26Bibliographically approved
Smirnov, S., Anoshkin, I. V., Demchenko, P., Gomon, D., Lioubtchenko, D. V., Khodzitsky, M. & Oberhammer, J. (2018). Optically controlled dielectric properties of single-walled carbon nanotubes for terahertz wave applications. Nanoscale, 10(26), 12291-12296
Open this publication in new window or tab >>Optically controlled dielectric properties of single-walled carbon nanotubes for terahertz wave applications
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2018 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 10, no 26, p. 12291-12296Article in journal (Refereed) Published
Abstract [en]

Materials with tunable dielectric properties are valuable for a wide range of electronic devices, but are often lossy at terahertz frequencies. Here we experimentally report the tuning of the dielectric properties of single-walled carbon nanotubes under light illumination. The effect is demonstrated by measurements of impedance variations at low frequency as well as complex dielectric constant variations in the wide frequency range of 0.1-1 THz by time domain spectroscopy. We show that the dielectric constant is significantly modified for varying light intensities. The effect is also practically applied to phase shifters based on dielectric rod waveguides, loaded with carbon nanotube layers. The carbon nanotubes are used as tunable impedance surface controlled by light illumination, in the frequency range of 75-500 GHz. These results suggest that the effect of dielectric constant tuning with light, accompanied by low transmission losses of the carbon nanotube layer in such an ultra-wide band, may open up new directions for the design and fabrication of novel Terahertz and optoelectronic devices.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2018
Keywords
Requency-Range, Millimeter, Conductivity, Technology, Guides
National Category
Nano Technology
Identifiers
urn:nbn:se:kth:diva-230899 (URN)10.1039/C8NR03740J (DOI)000438246000006 ()29926050 (PubMedID)2-s2.0-85049850363 (Scopus ID)
Funder
EU, Horizon 2020, 675683EU, Horizon 2020, 616846
Note

QC 20180625

Available from: 2018-06-21 Created: 2018-06-21 Last updated: 2022-11-30Bibliographically approved
Gomon, D., Gusev, S., Demchenko, P., Anoshkin, I. V., Lioubtchenko, D. & Khodzitsky, M. (2018). Opticaly tunable conductivity of carbon nanotubes in terahertz frequency range. In: Optics InfoBase Conference Papers: . Paper presented at Frontiers in Optics, FIO 2018, 16 September 2018 through 20 September 2018. OSA - The Optical Society
Open this publication in new window or tab >>Opticaly tunable conductivity of carbon nanotubes in terahertz frequency range
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2018 (English)In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2018Conference paper, Published paper (Refereed)
Abstract [en]

Impact of infrared radiation illumination (980 nm) on the properties of carbon nanotubes (CNT), such as complex conductivity and permittivity, with different geometric parameters in the frequency range of 0.2-1.0 THz was studied. 

Place, publisher, year, edition, pages
OSA - The Optical Society, 2018
Keywords
Infrared radiation, Terahertz waves, Yarn, Complex conductivity, Frequency ranges, Terahertz frequency range, Tunable conductivity, Carbon nanotubes
National Category
Composite Science and Engineering
Identifiers
urn:nbn:se:kth:diva-247438 (URN)10.1364/FIO.2018.JTu2A.40 (DOI)2-s2.0-85059374360 (Scopus ID)9781943580460 (ISBN)
Conference
Frontiers in Optics, FIO 2018, 16 September 2018 through 20 September 2018
Note

QC20190418

Available from: 2019-04-18 Created: 2019-04-18 Last updated: 2022-06-26Bibliographically approved
Demchenko, P., Gomon, D., Anoshkin, I. V., Smirnov, S., Lioubtchenko, D. & Khodzitsky, M. (2018). Study of influence of densification on control of conductivity and spectral characteristics of thin films of carbon nanotubes in terahertz frequency range. In: EPJ Web of Conferences: . Paper presented at 3rd International Conference "Terahertz and Microwave Radiation: Generation, Detection and Applications", TERA 2018, Nizhny Novgorod, Russian Federation, 22 October 2018 through 25 October 2018. EDP Sciences, Article ID 06022.
Open this publication in new window or tab >>Study of influence of densification on control of conductivity and spectral characteristics of thin films of carbon nanotubes in terahertz frequency range
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2018 (English)In: EPJ Web of Conferences, EDP Sciences, 2018, article id 06022Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
EDP Sciences, 2018
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:kth:diva-241411 (URN)10.1051/epjconf/201819506022 (DOI)000589873300109 ()2-s2.0-85058294548 (Scopus ID)
Conference
3rd International Conference "Terahertz and Microwave Radiation: Generation, Detection and Applications", TERA 2018, Nizhny Novgorod, Russian Federation, 22 October 2018 through 25 October 2018
Note

QC 20190121

Available from: 2019-01-21 Created: 2019-01-21 Last updated: 2022-06-26Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-6260-2694

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