Plasmonic Emission of Bullseye Nanoemitters on Bi2Te3 Nanoflakes

被引：4

作者：

Yan, Qigeng ^{[1
]}

Li, Xiaoli ^{[1
]}

Liang, Baolai ^{[1
]}

机构：

[1] Hebei Univ, Coll Phys Sci & Technol, Hebei Key Lab Opt Elect Informat & Mat, Baoding 071002, Peoples R China

来源：

MATERIALS | 2020年 / 13卷 / 07期

基金：

中国国家自然科学基金;

关键词：

Bi2Te3; nanoflakes; bullseye nanostructure; cathodoluminescence; plasmonic resonance; SURFACE-PLASMONS; TOPOLOGICAL INSULATORS; LIGHT; GOLD;

D O I：

10.3390/ma13071531

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Topological insulators, such as Bi2Te3, have been confirmed to exhibit plasmon radiation over the entire visible spectral range. Herein, we fabricate bullseye nanoemitters, consisting of a central disk and concentric gratings, on the Bi2Te3 nanoflake. Due to the existence of edge plasmon modes, Bi2Te3 bullseye nanostructures are possible to converge light towards the central disk. Taking advantage of the excellent spatial resolution of cathodoluminescence (CL) characterization, it has been observed that plasmonic behaviors depend on the excitation location. A stronger plasmonic intensity and a wider CL spectral linewidth can be obtained at the edge of the central disk. In order to further improve the focusing ability, a cylindrical Pt nanostructure has been deposited on the central disk. Additionally, the finite element simulation indicates that the electric-field enhancement originates from the coupling process between the plasmonic emission from the Bi2Te3 bullseye and the Pt nanostructure. Finally, we find that enhancement efficiency depends on the thickness of the Pt nanostructure.

引用

页数：8