期刊
OPTICS EXPRESS
卷 23, 期 3, 页码 2032-2039出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.23.002032
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资金
- National Program of Key Basic Research Project of China (973 Program) [2014CB339806]
- Major National Development Project of Scientific Instrument and Equipment [2011YQ150021, 2012YQ14000504]
- National Natural Science Foundation of China [11104186, 61307126, 61138001]
- Scientific Research Innovation Project of Shanghai Municipal Education Commission [14YZ093]
- Key Scientific and Technological Project of Science and Technology Commission of Shanghai Municipality [12JC1407100]
- Program of Shanghai Subject Chief Scientist [14XD1403000]
Terahertz (THz) perfect absorber, as a useful functional device, has attracted considerable attention. Traditional metamaterial perfect absorbers are usually in response to single-frequency or multi-frequency owing to the resonance features of the metal-based sub-wavelength structure. In this paper, a simple double-layered doped-silicon grating structure was designed to realize an ultra-broadband and polarization-independent THz perfect absorber. Both theoretical and experimental results demonstrate that the incident THz waves ranging from 0.59 to 2.58 THz can be efficiently absorbed with an absorptivity of more than 95% and a bandwidth of about 2.0 THz. The excellent characteristic of this broad-bandwidth THz perfect absorber is mainly resulted from the air gap mode resonance together with the first-order and the second-order grating diffractions. (C) 2015 Optical Society of America
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