Tuning Plasmonic Near-Perfect Absorber for Selective Absorption Applications
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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.
KeywordsPlasmonic Absorber Metamaterials Broadband
This work was financially supported by the National Natural Science Foundation of China (Grant No. 51676060), the Natural Science Funds of Heilongjiang Province for Distinguished Young Scholars (Grant No. JC2016009), and the Science Creative Foundation for Distinguished Young Scholars in Harbin (Grant No. 2014RFYXJ004).
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