| HUANG Xiutao,ZHANG Chunbo,CONG Lin,FAN Jun,YUAN Hang.Investigation of wide-angle thin metamaterial absorber at infrared region[J].Optoelectronics Letters,2021,17(11):669-672 |
| Investigation of wide-angle thin metamaterial absorber at infrared region |
| Author Name | Affiliation | | HUANG Xiutao | Aerospace Institute of Advanced Materials & Processing Technology, Beijing 100074, China | | ZHANG Chunbo | Aerospace Institute of Advanced Materials & Processing Technology, Beijing 100074, China | | CONG Lin | Aerospace Institute of Advanced Materials & Processing Technology, Beijing 100074, China | | FAN Jun | Aerospace Institute of Advanced Materials & Processing Technology, Beijing 100074, China | | YUAN Hang | Aerospace Institute of Advanced Materials & Processing Technology, Beijing 100074, China |
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| Abstract: |
| In the practical application, a wide-angle absorption with simple structure is still crucial property of metamaterial absorbers (MAs). A single-band infrared MA is introduced to analyze the angle insensitive mechanism. Numerical simulation reveals that a perfect absorption peak with 99.9% (7.55 μm) is achieved at normal incidence, as well as the absorptivity 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 harvester and plasmonic sensors. |
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