Refractive index sensing and switching of leaky states in a metasurface

被引：2
|
作者：
Muhammad, Naseer [1 ]
Wang, Guo Ping [1 ]
机构：
[1] Shenzhen Univ, Inst Microscale Optoelect, Shenzhen 518060, Peoples R China
来源：
OPTICS LETTERS | 2021年 / 46卷 / 20期
基金：
中国国家自然科学基金;
关键词：
OPTICAL BOUND-STATES; FANO RESONANCES; CONTINUUM;
D O I：
10.1364/OL.442324
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We theoretically propose leaky states in an electro-optic (EO)-based all-dielectric metasurface. The EO substrate tunes leaky modes to the desired wave band with changes in applied voltage (Vapp). For refractive index (RI) sensing, the highest figure-of-merit (FoM) in this work is 9166, quality factor (Q-factor) is 1.7450(-4), sensitivity is 407 nm/RIU (in RI range of 1.00-1.03), minimum detectable RI is 1.0542(-4), and relative sensitivity is 9.94(-4) V-1. The structure sustains the figure and line shape of leaky modes, high Q-factor, and FoM at different Vapp and EO-coefficients. Our FoM and Q-factor are high, and the minimum detectable RI is smaller than previously reported. The giant Q-factor is promising for optical filters, modulation, and slow-light device applications. (C) 2021 Optical Society of America.
引用
收藏
页码：5120 / 5123
页数：4
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