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Indexed by:期刊论文

Date of Publication:2016-02-01

Journal:MATERIALS EXPRESS

Included Journals:SCIE、Scopus

Volume:6

Issue:1

Page Number:45-52

ISSN No.:2158-5849

Key Words:Metamaterials; Perfect Absorber; Surface Plasmons; Tunable; Topological Insulator; Dielectric Function; Simulation

Abstract: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.