Title :
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
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;
Conference_Titel :
Control & Automation (ICCA), 11th IEEE International Conference on
Conference_Location :
Taichung
DOI :
10.1109/ICCA.2014.6871103
