光学波段具有可调负折射指数的拓扑绝缘体超材料。

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

Nanoscale Res Lett. 2013 Dec 13;8(1):526. doi: 10.1186/1556-276X-8-526.

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.

一种基于拓扑绝缘体（碲化铋，Bi2Se3）的可调谐近红外（NIR）光谱区双负折射指数的蓝移超材料（MM）已经被证明。探索了 Bi2Se3 作为多层 MM 介电层的潜力。使用有限差分时域（FDTD）方法数值研究了穿透 Au/Bi2Se3/Au 薄膜的椭圆形纳米孔阵列的光学响应。在 Bi2Se3 从三角晶相和正交晶相之间切换后，MM 的蓝移调谐范围高达 370nm（从 2140nm 到 1770nm）。