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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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Autores principales: Kim, Teun-Teun, Oh, Sang Soon, Kim, Hyeon-Don, Park, Hyun Sung, Hess, Ortwin, Min, Bumki, Zhang, Shuang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5621972/
https://www.ncbi.nlm.nih.gov/pubmed/28975151
http://dx.doi.org/10.1126/sciadv.1701377
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author Kim, Teun-Teun
Oh, Sang Soon
Kim, Hyeon-Don
Park, Hyun Sung
Hess, Ortwin
Min, Bumki
Zhang, Shuang
author_facet Kim, Teun-Teun
Oh, Sang Soon
Kim, Hyeon-Don
Park, Hyun Sung
Hess, Ortwin
Min, Bumki
Zhang, Shuang
author_sort Kim, Teun-Teun
collection PubMed
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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spelling pubmed-56219722017-10-03 Electrical access to critical coupling of circularly polarized waves in graphene chiral metamaterials Kim, Teun-Teun Oh, Sang Soon Kim, Hyeon-Don Park, Hyun Sung Hess, Ortwin Min, Bumki Zhang, Shuang Sci Adv Research Articles 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. American Association for the Advancement of Science 2017-09-29 /pmc/articles/PMC5621972/ /pubmed/28975151 http://dx.doi.org/10.1126/sciadv.1701377 Text en Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). http://creativecommons.org/licenses/by-nc/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (http://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
spellingShingle Research Articles
Kim, Teun-Teun
Oh, Sang Soon
Kim, Hyeon-Don
Park, Hyun Sung
Hess, Ortwin
Min, Bumki
Zhang, Shuang
Electrical access to critical coupling of circularly polarized waves in graphene chiral metamaterials
title Electrical access to critical coupling of circularly polarized waves in graphene chiral metamaterials
title_full Electrical access to critical coupling of circularly polarized waves in graphene chiral metamaterials
title_fullStr Electrical access to critical coupling of circularly polarized waves in graphene chiral metamaterials
title_full_unstemmed Electrical access to critical coupling of circularly polarized waves in graphene chiral metamaterials
title_short Electrical access to critical coupling of circularly polarized waves in graphene chiral metamaterials
title_sort electrical access to critical coupling of circularly polarized waves in graphene chiral metamaterials
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5621972/
https://www.ncbi.nlm.nih.gov/pubmed/28975151
http://dx.doi.org/10.1126/sciadv.1701377
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