期刊
ACS NANO
卷 8, 期 10, 页码 10885-10892出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn504708t
关键词
plasmonics; perfect absorbers; angular dispersion; impedance matching
类别
资金
- Deutsche Forschungsgemeinschaft [SPP1391, FOR730, GI 269/11-1]
- Bundesministerium fur Bildung und Forschung [13N9048, 13N10146]
- ERC COMPLEXPLAS
- Baden-Wurttemberg Stiftung (Spitzenforschung II)
- Ministerium fur Wissenschaft, Forschung und Kunst Baden-Wurttemberg [Az: 7533-7-11.6-8]
- Carl-Zeiss-Stiftung
- FIRST Program of the Israel Science Foundation [1046/10]
- European Cooperation in Science and Technology through COST Action [MP1302]
- German-Israel Foundation (GIF)
- Alexander-von-Humboldt Foundation
Plasmonic devices with absorbance close to unity have emerged as essential building blocks for a multitude of technological applications ranging from trace gas detection to infrared imaging. A crucial requirement for such elements is the angle independence of the absorptive performance. In this work, we develop theoretically and verify experimentally a quantitative model for the angular behavior of plasmonic perfect absorber structures based on an optical impedance matching picture. To achieve this, we utilize a simple and elegant k-space measurement technique to record quantitative angle-resolved reflectance measurements on various perfect absorber structures. Particularly, this method allows quantitative reflectance measurements on samples where only small areas have been nanostructured, for example, by electron-beam lithography. Combining these results with extensive numerical modeling, we find that matching of both the real and imaginary parts of the optical impedance is crucial to obtain perfect absorption over a large angular range. Furthermore, we successfully apply our model to the angular dispersion of perfect absorber geometries with disordered plasmonic elements as a favorable alternative to current array-based designs.
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