期刊
OPTICAL MATERIALS
卷 62, 期 -, 页码 28-33出版社
ELSEVIER
DOI: 10.1016/j.optmat.2016.09.042
关键词
Metamaterial absorber/reflector; Polarization insensitive; Photoconductive silicon; Cross-shaped structure
资金
- gs1:National Natural Science Foundation of China [U1435209, 61605147]
- Youth science and technology backbone cultivation plan project of the Wuhan University of Science and Technology [2016xz010]
We present a photoexcited switchable perfect metamaterial absorber/reflector for terahertz waves. The switchable absorber/reflector is based on a cross-shaped structure (CSS) integrated semiconductor photoconductive silicon (Si). The electric response property of the photoconductive Si can be easily modified through a pump optical beam. The conductivity of Si pads filled in the gap of CSS is tuned efficiently through the incident pump optical beam with different power, resulting in the modulation of absorption magnitude from 0 to 100% at the fixed operation frequency. Thus, the switch ability of the perfect absorber/reflector can be easily realized. Furthermore, the proposed design is polarization insensitive and operated well at wide incidence angles for both TE and TM waves. (C) 2016 Elsevier B.V. All rights reserved.
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