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Sub‐THz Phase Shifters Enabled by Photoconductive Single‐Walled Carbon Nanotube Layers
KTH, School of Electrical Engineering and Computer Science (EECS), Intelligent systems, Micro and Nanosystems.ORCID iD: 0000-0003-0368-1668
Institute of High-Pressure Physics PAS.ORCID iD: 0000-0002-3143-5491
Institute of High-Pressure Physics PAS.
ITMO University.ORCID iD: 0000-0002-8867-0927
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2022 (English)In: Advanced Photonics Research, ISSN 2699-9293, p. 2200042-2200042Article in journal (Refereed) Published
Abstract [en]

Materials with tunable dielectric properties are highly relevant for terahertz (THz) applications. Herein, the tuning of the dielectric response of single-walled carbon nanotube layers by light illumination is studied for applications to THz phase shifters. The dependence of the length of individual nanotubes on the THz photoconductivity of the network is experimentally investigated in the frequency range of 0.2–1 THz by time-domain spectroscopy (TDS). The effective conductivity of the networks is described by a theoretical model that fits the measured dielectric function. Terahertz phase shifters are realized with the carbon nanotube layers as the optically tunable element deposited on the wall of rectangular dielectric waveguides. The phase of the electromagnetic wave propagating in the waveguide is shown to be tunable by illuminating the nanotubes. A linear phase shift with the frequency is measured between 75 and 500 GHz with a low change in amplitude due to the illumination.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2022. p. 2200042-2200042
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-320785DOI: 10.1002/adpr.202200042ISI: 000969071400010OAI: oai:DiVA.org:kth-320785DiVA, id: diva2:1707541
Funder
European Regional Development Fund (ERDF), MAB/2018/9EU, Horizon 2020, 862788
Note

QC 20230529

Available from: 2022-10-31 Created: 2022-10-31 Last updated: 2023-05-29Bibliographically approved

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Smirnov, SergueiOberhammer, JoachimLioubtchenko, Dmitri

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Smirnov, SergueiPrzewłoka, AleksandraZykov, DmitryDemchenko, PetrOberhammer, JoachimLioubtchenko, Dmitri
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