期刊
NANOSCALE ADVANCES
卷 3, 期 14, 页码 4072-4078出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1na00246e
关键词
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资金
- National Natural Science Foundation of China [61805127]
- Natural Science Foundation of Shandong Province, China [ZR2019BF014]
- Fundamental Research Funds of Shandong University [2018TB002]
- China Postdoctoral Science Foundation [2015M582073]
- Postdoctoral Innovation Program of Shandong Province [201602017]
The novel metamaterial absorber, made of only gold and silicon, exhibits near-perfect absorption in the terahertz band with four independent functions: selective perfect absorption, nearly 100% perfect absorption at multiple frequencies, broadband absorption with controllable band, and a combination of single-frequency absorption and broadband absorption.
A kind of near-perfect metamaterial absorber, made of only Au and Si, has been presented in the terahertz band with extremely high absorptance. A flexible design method is proposed, which could create absorbers with four independent functions as follows. First, selective perfect absorption is achieved at a single frequency, which means the absorptance is more than 99.9% at the required frequency and almost 0% at adjacent frequencies. Second, nearly 100% perfect absorption is realized at more frequencies, which can be changed by simply adjusting the geometric parameters. Third, broadband absorption with a controllable band is gained, and the average absorptance exceeds 99% from 1.2 to 2 THz. Finally, the combination of single-frequency absorption and broadband absorption is accomplished, which greatly expands the application prospects of the proposed absorber. Besides, the absorber exhibits high performance over a wide range of incident angles from 0 degrees to 60 degrees. Meanwhile, it is insensitive to both TE and TM waves. The aforementioned design idea can be extended to other bands.
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