Electrical access to critical coupling of circularly polarized waves in graphene chiral metamaterials

Active control of polarization states of electromagnetic waves is highly desirable because of its diverse applications in information processing, telecommunications, and spectroscopy. However, despite the recent advances using artificial materials, most active polarization control schemes require op...

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Veröffentlicht in:Science advances 2017-09, Vol.3 (9), p.e1701377-e1701377
Hauptverfasser: Kim, Teun-Teun, Oh, Sang Soon, Kim, Hyeon-Don, Park, Hyun Sung, Hess, Ortwin, Min, Bumki, Zhang, Shuang
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container_issue 9
container_start_page e1701377
container_title Science advances
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creator Kim, Teun-Teun
Oh, Sang Soon
Kim, Hyeon-Don
Park, Hyun Sung
Hess, Ortwin
Min, Bumki
Zhang, Shuang
description Active control of polarization states of electromagnetic waves is highly desirable because of its diverse applications in information processing, telecommunications, and spectroscopy. However, despite the recent advances using artificial materials, most active polarization control schemes require optical stimuli necessitating complex optical setups. We experimentally demonstrate an alternative-direct electrical tuning of the polarization state of terahertz waves. Combining a chiral metamaterial with a gated single-layer sheet of graphene, we show that transmission of a terahertz wave with one circular polarization can be electrically controlled without affecting that of the other circular polarization, leading to large-intensity modulation depths (>99%) with a low gate voltage. This effective control of polarization is made possible by the full accessibility of three coupling regimes, that is, underdamped, critically damped, and overdamped regimes by electrical control of the graphene properties.
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subjects Applied Optics
Physical Sciences
SciAdv r-articles
title Electrical access to critical coupling of circularly polarized waves in graphene chiral metamaterials
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