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Issue 31, 2019
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Single-walled carbon nanotube layers for millimeter-wave beam steering

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Abstract

The ability to efficiently transmit and manipulate high-frequency signals poses major challenges resulting in a lack of active and reconfigurable millimeter-wave and terahertz devices that are needed to enable beyond-5G broadband communication systems. Here, thin single-walled carbon nanotube (SWCNT) layers are introduced as a tunable impedance surface for millimeter-waves. Carbon nanotube layers are integrated with dielectric rod waveguides. Their surface impedance, tuned by light, is shown to modify the wave propagation inside the waveguide. A direct application of the effect is a phase shifter, demonstrated experimentally and by numerical simulations. Additionally, an antenna array of two dielectric waveguides, one covered in SWCNTs, is designed and fabricated. The proof-of-concept illustrates optically-controlled beam steering enabled by carbon nanotubes, and directions for further device optimizations are provided. These findings demonstrate thin SWCNT layers as an optically-reconfigurable element, suitable for broadband millimeter-wave communications.

Graphical abstract: Single-walled carbon nanotube layers for millimeter-wave beam steering

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Supplementary files

Article information


Submitted
28 Mar 2019
Accepted
11 Jul 2019
First published
12 Jul 2019

This article is Open Access

Nanoscale, 2019,11, 14691-14697
Article type
Paper

Single-walled carbon nanotube layers for millimeter-wave beam steering

S. Smirnov, D. V. Lioubtchenko and J. Oberhammer, Nanoscale, 2019, 11, 14691
DOI: 10.1039/C9NR02705J

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    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
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    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
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    [Original citation] - Published by The Royal Society of Chemistry.

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