Abstract
Optical switching based on metamaterial has attracted wide attention for its outstanding performance in light controlling and energy manipulation. Here, we present a theoretical investigation of tunable plasmonic absorption based on a plasmonic nanostructure with phase-changing material. The structure consists of double metal layers covered with nanoholes for perfect optical absorption. To make the optical absorption tunable, we design a Ge2Sb2Te5 (GST) layer located between the double metal layers. Our design of the metamaterial structure can realize absorption switching through crystalline and amorphous phase transitions in near infrared range. Moreover, by tuning the different crystallization, the plasmonic absorption can be adjusted from 99.1% to 4.9%. The demonstration will pave the way towards the dynamical optical absorption control in both the nano-science field and a number of applications, including plasmonic switch, plasmonic modulator and plasmonic metasurfaces.
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