期刊
NANOTECHNOLOGY
卷 28, 期 9, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/aa57ad
关键词
terahertz; graphene; ionic liquid; reflection
资金
- National Research Foundation, Prime Minister's Office, Singapore under its Medium Size Centre programme
We report a highly efficient tunable THz reflector in graphene. By applying a small gate voltage (up to +/- 3V), the reflectance of graphene is modulated from a minimum of 0.79% to a maximum of 33.4% using graphene/ionic liquid structures at room temperature, and the reflection tuning is uniform within a wide spectral range (0.1-1.5 THz). Our observation is explained by the Drude model, which describes the THz wave-induced intraband transition in graphene. This tunable reflectance of graphene may contribute to broadband THz mirrors, deformable THz mirrors, variable THz beam splitters and other optical components.
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