High Q-factor multiple Fano resonances for high-sensitivity sensing in all-dielectric nanocylinder dimer metamaterials

被引：19

作者：

Wang, Wu-Deng ^{[1
]}

Zheng, Li ^{[1
]}

Qi, Jian-Guang ^{[1
]}

机构：

[1] Dalian Polytech Univ, Informat Sci & Engn Coll, Dalian 116034, Peoples R China

来源：

APPLIED PHYSICS EXPRESS | 2019年 / 12卷 / 07期

基金：

中国国家自然科学基金;

关键词：

METASURFACES;

D O I：

10.7567/1882-0786/ab206a

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We investigated the high Q-factor, high modulation depth, and multiple Fano resonances based on a periodical all-dielectric asymmetric nanocylinder dimer. It is demonstrated that due to excitation of subradiant hybrid modes five sharp Fano resonances can be achieved by breaking symmetry and can be flexibly tuned by geometry. All Fano resonances have a narrow line width, maximal Q-factor exceeds 5000 and even minimal Q-factor also reaches 870. Moreover, modulation depth can reach nearly 100%. In addition, the bulk refractive index sensitivity exceeds 530 nm/RIU, and maximal figure of merit reaches 3350. The proposed array is useful for nonlinear optics and biosensing. (C) 2019 The Japan Society of Applied Physics

引用

页数：6