期刊
APPLIED PHYSICS LETTERS
卷 106, 期 15, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4918289
关键词
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资金
- National High Tech (863) Projects [2012AA030402, 2011AA010202]
- National Science Foundation of China [61138001, 61171024, 61171026]
- 111 Project [111-2-05]
We present the simulation, implementation, and measurement of a broadband terahertz (THz) metamaterial absorber. By stacking 12 metallic bars of varying lengths on three polyimide layers with equal spacing, a broadband absorption spectrum is formed through merging multiple successive resonance peaks. The measured total absorption exceeds 95% from 0.81 to 1.32 THz at the normal incidence and the full width at half maximum is 64% (from 0.76 to 1.48 THz). The absorption decreases with fluctuations as the incident angle increases but remains above 62% even at the incident angle of 40 degrees. The physical explanation to the absorption mechanism is presented and verified by a 9-bar example, which exhibits narrower absorption bandwidth. It is also experimentally demonstrated that the proposed structure is robust against misalignment of each metallic layer. (c) 2015 AIP Publishing LLC.
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