Simulation of tunable metamaterial perfect absorber by modulating Bi2Se3 dielectric function
We numerically present an effective method for tuning the intrinsic resonance of metamaterial perfect absorber by taking advantage of phase transition in a topological insulator (bismuth selenide, Bi2Se3) in the near-infrared (NIR) region. The design consists of an array of square Au rods separated from a continuous Au film by a Bi2Se3 dielectric interlayer. It is shown that a large shift of 280 nm in the resonance wavelength can be obtained by switching Bi2Se3 between its trigonal and orthorhombic states. The strong absorbance shows a substantial overlap between TE and TM polarization states over a wide range of incident angles.
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Document Type: Research Article
Publication date: February 1, 2016
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