Investigation of wide-angle thin metamaterial absorber at infrared region

• 作者: HUANG Xiutao ZHANG Chunbo CONG Lin FAN Jun YUAN Hang
• 来源期刊: 光电子快报（英文版）
• 年，卷（期）: 2021,（11）
• 所属期刊栏目: Devices
• 页码范围: 669-672
• 页数: 4页
• 语种: 英文
• DOI: 10.1007/s11801-021-1034-1

摘要

In the practical application,a wide-angle absorption with simple structure is still crucial property of metamaterial ab-sorbers(MAs).A single-band infrared MA is introduced to analyze the angle insensitive mechanism.Numerical simu-lation reveals that a perfect absorption peak with 99.9％(7.55 μm)is achieved at normal incidence,as well as the ab-sorptivity is respectively 69.7％(7.46 μm)and 93.5％(7.46 μm)for transverse electric(TE)and transverse magnetic(TM)modes at 70° incidence.By changing substrate thickness,the absorption ratio at 70° is increased to 91％(7.46 μm)for TE mode.Our design can also keep the good absorption stability for the geometric parameters.The Ez-field distributions for different incident angles are given to investigate the physical mechanism.The designed MA can realize good wide-angle tolerance.This MA owns great applications,including infrared spectroscopy,solar har-vester and plasmonic sensors.