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

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Title
Electrical access to critical coupling of circularly polarized waves in graphene chiral metamaterials
Author(s)
Teun-Teun Kim; Sang Soon Oh; Hyeon-Don Kim; Hyun Sung Park; Ortwin Hess; Bumki Min; Shuang Zhang
Publication Date
2017-09
Journal
SCIENCE ADVANCES, v.3, no.9, pp.e1701377 -
Publisher
AMER ASSOC ADVANCEMENT SCIENCE
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 Copyright © 2017 The Authors, some rights reserved
URI
https://pr.ibs.re.kr/handle/8788114/4784
ISSN
2375-2548
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
Files in This Item:
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