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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 and Zhang, Shuang 2017. Electrical access to critical coupling of circularly polarized waves in graphene chiral metamaterials. Science Advances 3 (9) , e1701377. 10.1126/sciadv.1701377

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Abstract

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.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Publisher: American Association for the Advancement of Science
ISSN: 2375-2548
Date of First Compliant Deposit: 11 December 2017
Date of Acceptance: 11 September 2017
Last Modified: 12 Dec 2017 14:28
URI: http://orca-mwe.cf.ac.uk/id/eprint/107519

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