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

doi:10.1088/1674-1056/ab8892

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
Accepted manuscript online:

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

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