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Electrically tunable THz graphene metasurface wave retarders

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Title
Electrically tunable THz graphene metasurface wave retarders
Author(s)
Park, Hyunwoo; Jeong, Sodam; Seo, Changwon; Park, Hyeongi; Oh, Donghak; Shim, Jae-Eon; Lee, Jaeyeong; Taewoo Ha; Kim, Hyeon-Don; Baek, Soojeong; Min, Bumki; Kim, Teun-Teun
Publication Date
2023-06
Journal
NANOPHOTONICS, v.12, no.13, pp.2553 - 2562
Publisher
WALTER DE GRUYTER GMBH
Abstract
© 2023 the author(s), published by De Gruyter, Berlin/Boston. Anisotropic materials with chirality or birefringence can be used to manipulate the polarization states of electromagnetic waves. However, the comparatively low anisotropy of natural materials hinders the miniaturization of optical components and devices at terahertz frequencies. In this study, we experimentally demonstrate that the relative phase retardation of a THz wave can be electrically controlled by integrating patterned mono- and bilayer graphene onto an otherwise isotropic metasurface. Specifically, we show that a refractive index for one of the orthogonal polarization states can be electrically controlled by modulating graphene's conductivity, thereby weakening the capacitive coupling between adjacent meta-atoms in an anisotropic manner. With monolayer graphene, phase retardation of 15 degrees to 81 degrees between two orthogonal polarization states can be achieved. Maximum phase retardation of 90 degrees through a metasurface with bilayer graphene suggests its use as a tunable quarter-wave plate. Continuous control from linear- to circular-polarization states may provide a wide range of opportunities for the development of compact THz polarization devices and polarization-sensitive THz technology.
URI
https://pr.ibs.re.kr/handle/8788114/13571
DOI
10.1515/nanoph-2022-0812
ISSN
2192-8606
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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