Release Time:2019-03-13  Hits:

Indexed by: Journal Article

Date of Publication: 2016-02-01

Journal: MATERIALS EXPRESS

Included Journals: Scopus、SCIE

Volume: 6

Issue: 1

Page Number: 45-52

ISSN: 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.