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

Author

Shuai Wang ; Tun Cao

Author_Institution

Dept. of Biomed. Eng., Dalian Univ. of Technol., Dalian, China

fYear

2014

fDate

18-20 June 2014

Firstpage

1255

Lastpage

1258

Abstract

A blue-shift tunable metamaterial(MM) exhibiting a double-negative refractive index based on 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 blue-shift tuning range of the MM is as high as 370nm (from 2140nm to 1770nm) after switching the Bi₂Se₃ between its trigonal and orthorhombic states.

Keywords

bismuth compounds; dielectric materials; finite difference time-domain analysis; gold; infrared spectra; nanophotonics; optical arrays; optical metamaterials; optical multilayers; optical tuning; refractive index; spectral line shift; topological insulators; Au-Bi₂Se₃-Au; blue-shift tunable metamaterial; dielectric interlayer; double-negative refractive index; elliptical nanohole arrays; finite difference time domain method; gold-bismuth selenide-gold films; multilayer metamaterials; near-infrared spectral region; topological insulator metamaterials; trigonal-orthorhombic state switching; wavelength 2140 nm to 1770 nm; Dielectrics; Gold; Metamaterials; Optical films; Optical refraction; Optical variables control; Topological insulators;

fLanguage

English

Publisher

ieee

Conference_Titel

Control & Automation (ICCA), 11th IEEE International Conference on

Conference_Location

Taichung

Type

conf

DOI

10.1109/ICCA.2014.6871103

Filename

6871103