Broadband Visible and Near-Infrared Absorbers Implemented with Planar Nanolayered Stacks

被引:31
|
作者
Kim, Jaeyong [1 ]
Oh, Harim [1 ]
Kang, Beomseung [1 ]
Hong, Jongill [1 ]
Rha, Jong-Joo [2 ]
Lee, Myeongkyu [1 ]
机构
[1] Yonsei Univ, Dept Mat Sci & Engn, Seoul 120749, South Korea
[2] Korea Inst Mat Sci, Surface Technol Div, Chang Won 51508, South Korea
来源
ACS APPLIED NANO MATERIALS | 2020年 / 3卷 / 03期
关键词
perfect absorber; Fabry-Perot cavity; metal-insulator-metal structure; dielectric function; planar thin-film stack; PLASMONIC PERFECT ABSORBER; METAMATERIAL ABSORBER; OPTICAL-PROPERTIES; LARGE-AREA; PHOTODETECTION; COLLECTION; RESONANCES; GENERATION; SILVER; METAL;
D O I
10.1021/acsanm.0c00265
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Broadband light absorbers are highly desirable in various applications including solar-energy harvesting, thermo-photovoltaics, and photon detection. The Fabry-Perot (F-P) cavity comprising metal-insulator-metal (MIM) layers has attracted enormous interest as a lithography-free structure for realizing planar super absorbers. However, typical F-P cavity exhibits a narrow absorption band, and efforts have thus been made to increase the absorption bandwidth. This study demonstrates that near-perfect absorption over a broad spectral range can be obtained from the MIM structure by using thermally evaporated Ag and Au thin films whose dielectric and optical properties are much different from bulk-state properties because of their nanoscale features. A 55 nm thick SiO2 spacer sandwiched between a 10 nm Ag top layer and a 100 nm Al back reflector exhibits absorption >95% in the visible range of 400-700 nm. The broad absorption band shifts to a near-infrared range of 650-1000 nm by replacing the top layer with a 10 nm thick Au film and increasing the SiO2 spacer thickness to 115 nm. The experimental results are supported by finite-difference time-domain simulation. The large absorption bandwidth is attributed to the lossy nature of the nanostructured top metallic layer combined with the resonant absorption of the MIM cavity.
引用
收藏
页码:2978 / 2986
页数:9
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