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

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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.
Publisher
American Association for the Advancement of Science (AAAS)
Issue Date
2017-09
Language
English
Article Type
Article
Citation

SCIENCE ADVANCES, v.3, no.9

ISSN
2375-2548
DOI
10.1126/sciadv.1701377
URI
http://hdl.handle.net/10203/237719
Appears in Collection
ME-Journal Papers(저널논문)
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