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Optically controlled dielectric properties of single-walled carbon nanotubes for terahertz wave applications
KTH, School of Electrical Engineering and Computer Science (EECS), Micro and Nanosystems.ORCID iD: 0000-0003-0368-1668
KTH, School of Electrical Engineering and Computer Science (EECS), Micro and Nanosystems.ORCID iD: 0000-0002-6260-2694
ITMO University.ORCID iD: 0000-0003-4948-2023
ITMO University.ORCID iD: 0000-0002-5799-3379
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2018 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372Article 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 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.
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:kth:diva-230899DOI: 10.1039/C8NR03740JOAI: oai:DiVA.org:kth-230899DiVA, id: diva2:1222486
Funder
EU, Horizon 2020, 675683EU, Horizon 2020, 616846
Note

QC 20180625

Available from: 2018-06-21 Created: 2018-06-21 Last updated: 2018-06-25Bibliographically approved

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Smirnov, SergueiAnoshkin, Ilya V.Demchenko, PetrGomon, DanielLioubtchenko, Dmitri V.Khodzitsky, MikhailOberhammer, Joachim
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