A high-performance broadband terahertz absorber based on sawtooth-shape doped-silicon

Perfect absorbers with broadband absorption of terahertz (THz) radiation are promising for applications in imaging and detection to enhance the contrast and sensitivity, as well as to provide concealment. Different from previous two-dimensional structures, here we put forward a new type of THz absor...

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Bibliographic Details
Published in:AIP advances 2016-05, Vol.6 (5), p.055112-055112-6
Main Authors: Du, Liang-Hui, Li, Jiang, Zhai, Zhao-Hui, Meng, Kun, Liu, Qiao, Zhong, Sen-Cheng, Zhou, Ping-Wei, Zhu, Li-Guo, Li, Ze-Ren, Peng, Qi-Xian
Format: Article
Language:English
Subjects:
Absorbers
ABSORPTION
Broadband
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DETECTION
DOPED MATERIALS
INTERFACES
OPTIMIZATION
PLASMA INSTABILITY
POLARIZATION
Power loss
POWER LOSSES
RESONANCE
SAWTOOTH OSCILLATIONS
SENSITIVITY
SILICON
TWO-DIMENSIONAL CALCULATIONS
TWO-DIMENSIONAL SYSTEMS
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Summary:Perfect absorbers with broadband absorption of terahertz (THz) radiation are promising for applications in imaging and detection to enhance the contrast and sensitivity, as well as to provide concealment. Different from previous two-dimensional structures, here we put forward a new type of THz absorber based on sawtooth-shape doped-silicon with near-unit absorption across a broad spectral range. Absorbance over 99% is observed numerically from 1.2 to 3 THz by optimizing the geometric parameters of the sawtooth structure. Our absorbers can operate over a wide range of incident angle and are polarization insensitive. The underlying mechanisms due to the combination of an air-cavity mode and mode-matching resonance on the air-sawtooth interface are analyzed in terms of the field patterns and electromagnetic power loss features.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4950800