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

• 作者: Jiu-Sheng Li Xu-Sheng Chen
• 来源期刊: 中国物理B（英文版）
• 关键词: far-infrared absorber semicircle-patterned graphene wide incident angle
• 年，卷（期）: 2020,（7）
• 页码范围: 157-163
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1056/ab8892

摘要

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.