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

Tun Cao* and Shuai Wang

Author Affiliations

Department of Biomedical Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China

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Nanoscale Research Letters 2013, 8:526  doi:10.1186/1556-276X-8-526

Published: 13 December 2013


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.