Abstract
In this paper, we design and investigate a dual-band nearly perfect light absorber by simulation method. It consists of a three-layered structure with a gold (Au) cylinder array layer and a Ge2Sb2Te2 (GST) spacer on the metal aluminum (Al) substrate. The absorber exhibits nearly perfect light absorbance in the infrared regime. The dependency of the light absorption performance on various geometric parameters is explored. Dynamically tunable of the light absorption peak in the range of 1050–1550 nm is achieved by changing the crystallization fraction of the GST material. The absorption performance is independent with the polarization angle of incidence light and the incident light direction. Furthermore, we demonstrate a high sensitivity refractive index (RI) sensor based on this structure. This tunable absorber exhibits great potential application in high-performance optoelectronic devices and sensors.
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