Abstract
Phase change materials (PCMs) are temperature-sensitive materials that transit between two different states. These materials have been employed to design switchable sensing and modulating devices. The Ge2Sb2Te5 (GST) material is a PCM which has two different phases as amorphous and crystalline states by temperature change. GST has been recently utilized to design novel tunable optical absorbers. In this research, a switchable wideband infrared absorber consisting of arrays of stacked GST cylindrical placed on top of a dielectric spacer terminated with a conducting layer acting as a back reflector is investigated. Having proper dimensions of the unit cell structure design, we achieved an infrared wideband metasurface absorber having absorption amplitude more than 90% (“ON”-state) in crystalline state while the absorption amplitude is less than 8.4% (“OFF”-state) in the amorphous phase of GST. Therefore, the structure switches in two “ON/OFF-state” through different annealing temperatures. Moreover, the sweep between the amorphous and crystalline phases of GST results in switching capability with the modulation depth greater than 0.9, as well as extinction ratio less than − 7 dB in the infrared frequency range of 17.5–45 THz. Furthermore, it is illustrated that the proposed structure is polarization-insensitive which has the ability to maintain superior absorption performance over a wide range of incident angles. It can be concluded that our proposed infrared switchable absorber is a suitable candidate for a broadband reflection modulating applications as well as thermal emitters and solar cell applications.
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Barzegar-Parizi, S., Vafapour, Z. A switchable polarization-independent broadband GST-based metasurface infrared absorber in modulating applications. Appl. Phys. A 129, 790 (2023). https://doi.org/10.1007/s00339-023-07078-y
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DOI: https://doi.org/10.1007/s00339-023-07078-y