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

Journal Article · Sun May 15 00:00:00 EDT 2016 · AIP Advances

DOI:https://doi.org/10.1063/1.4950800· OSTI ID:22611705

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 ^[1]

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1. Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, Sichuan 621900 (China)

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.

• OSTI ID: 22611705
• Journal Information: AIP Advances, Vol. 6, Issue 5; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 2158-3226
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
DETECTION
DOPED MATERIALS
INTERFACES
OPTIMIZATION
PLASMA INSTABILITY
POLARIZATION
POWER LOSSES
RESONANCE
SAWTOOTH OSCILLATIONS
SENSITIVITY
SILICON
TWO-DIMENSIONAL CALCULATIONS
TWO-DIMENSIONAL SYSTEMS