Ultra-broadband, wide angle absorber utilizing metal insulator multilayers stack with a multi-thickness metal surface texture

摘要: In this paper, we propose a facile route to fabricate metal insulator multilayer stack obtain ultra-broadband, wide angle behavior from the structure. The absorber, which covers near infrared (NIR) and visible (Vis) ranges, consists of metal-insulator-metal-insulator (MIMI) where middle layer has variant thickness. It is found that non-uniform thickness provides us with an absorption much broader compared planar architecture. case, each responsible for specific wavelength range overall superposition these resonant responses consequently broad, perfect light attained. We first numerically examine impact different geometries on property design. Afterward, designs characterize them experimentally verify our numerical findings. Characterizations show good agreement results optimum bandwidth design be 620 nm (380 nm–1000 nm) it significantly boosted amount 1060 nm (350 nm–1410 nm) multi-thickness case.