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Chin. Phys. B, 2020, Vol. 29(7): 078703    DOI: 10.1088/1674-1056/ab8892
Special Issue: SPECIAL TOPIC —Terahertz physics
SPECIAL TOPIC—Terahertz physics Prev   Next  

Adjustable polarization-independent wide-incident-angle broadband far-infrared absorber

Jiu-Sheng Li(李九生), Xu-Sheng Chen(陈旭生)
Centre for THz Research, China Jiliang University, Hangzhou 310018, China
Abstract  To promote the application of far-infrared technology, functional far-infrared devices with high performance are needed. Here, we propose a design scheme to develop a wide-incident-angle far-infrared absorber, which consists of a periodically semicircle-patterned graphene sheet, a lossless inter-dielectric spacer and a gold reflecting film. Under normal incidence for both TE- and TM-polarization modes, the bandwidth of 90% absorption of the proposed far-infrared absorber is ranging from 6.76 THz to 11.05 THz. The absorption remains more than 90% over a 4.29-THz broadband range when the incident angle is up to 50° for both TE- and TM-polarization modes. The peak absorbance of the absorber can be flexibly tuned from 10% to 100% by changing the chemical potential from 0 eV to 0.6 eV. The tunable broadband far-infrared absorber has promising applications in sensing, detection, and stealth objects.
Keywords:  far-infrared absorber      semicircle-patterned graphene      wide incident angle  
Received:  20 February 2020      Revised:  13 March 2020      Published:  05 July 2020
PACS:  87.50.-a (Effects of electromagnetic and acoustic fields on biological systems)  
  87.50.up (Dosimetry/exposure assessment)  
  87.10.Vg (Biological information)  
Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2016YFF0200306) and the National Natural Science Foundation of China (Grant Nos. 61871355 and 61831012).
Corresponding Authors:  Jiu-Sheng Li     E-mail:  jshli@126.com

Cite this article: 

Jiu-Sheng Li(李九生), Xu-Sheng Chen(陈旭生) Adjustable polarization-independent wide-incident-angle broadband far-infrared absorber 2020 Chin. Phys. B 29 078703

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