Topological insulator metamaterials with tunable negative refractive index in the optical region

Nanoscale Research Letters
Tun Cao, Shuai Wang

Abstract

A blueshift tunable metamaterial (MM) exhibiting a double-negative refractive index based on a topological insulator (bismuth selenide, Bi2Se3) has been demonstrated in the near-infrared (NIR) spectral region. The potential of Bi2Se3 as a dielectric interlayer of the multilayer MM is explored. The optical response of elliptical nanohole arrays penetrating through Au/Bi2Se3/Au films is numerically investigated using the finite difference time domain (FDTD) method. The blueshift tuning range of the MM is as high as 370 nm (from 2,140 to 1,770 nm) after switching the Bi2Se3 between its trigonal and orthorhombic states.

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Citations

Jun 25, 2014·Nanoscale Research Letters·Guangyuan SiFengwen Wang
Sep 25, 2014·Nanoscale Research Letters·Chunxu Bai, Yanling Yang
Aug 22, 2015·Nanoscale Research Letters·Hui Pan, Xue-Sen Wang
Oct 21, 2016·Nanoscale Research Letters·Chi-Ho CheungChing-Ray Chang

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