Tuning Plasmonic Near-Perfect Absorber for Selective Absorption Applications |
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Authors: | Chen Meijie He Yurong Ye Qin Zhu Jiaqi |
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Institution: | 1.School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China ;2.Heilongjiang Key Laboratory of New Energy Storage Materials and Processes, School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China ;3.Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY, 10027, USA ;4.Center for Composite Materials, Harbin Institute of Technology, Harbin, 150001, China ; |
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Abstract: | In this study, we present a high-performance tunable plasmonic absorber based on metal-insulator-metal nanostructures. High absorption is supported over a wide range of wavelengths, which is retained well at a very wide range of incident angles too. The coupling process occurs with high absorption efficiency of ~?99% by tuning the thickness of the dielectric layer. In addition, a complex trapezoidal nanostructure based on simple metal-insulator-metal structures by stacking different widths of Cu strip-nanostructures in the vertical direction has been put forward to enhance light absorption based on selective absorption. A trapezoidal sample has been designed with a solar absorption as high as 95% at wavelengths ranging from 300 nm to 2000 nm for different operating temperatures. Furthermore, the optical absorber has a very simple geometric structure and is easy to integrate into complex photonic devices. Perfect absorption and easy fabrication of the metal-insulator-metal structure make it an attractive device in numerous photonic applications. |
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