A photoexcited switchable perfect metamaterial absorber/reflector with polarization-independent and wide-angle for terahertz waves |
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| Affiliation: | 1. School of Information Science and Engineering, Wuhan University of Science and Technology, 430081, PR China;2. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, PR China;3. School of Electronics and Information Engineering, Beihang University, Beijing, 100191, PR China;1. Guangxi Key Laboratory of Precision Navigation Technology and Application, Guilin University of Electronic Technology, Guilin 541004, Guangxi, China;2. Guilin University of Electronic Technology, Guilin 541004, Guangxi, China;1. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, People’s Republic of China;2. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, People’s Republic of China;1. Advanced Applied Research Center, Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, Hefei, Anhui, 230026, PR China;2. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230026, PR China;3. Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Hefei 230026, PR China;4. CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, PR China;1. School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan, 430081, PR China;2. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, PR China |
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| Abstract: | 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. |
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| Keywords: | Metamaterial absorber/reflector Polarization insensitive Photoconductive silicon Cross-shaped structure |
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