Tuning Plasmonic Near-Perfect Absorber for Selective Absorption Applications
Tóm tắt
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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