Refractive index sensor based on multiple Fano resonances in a plasmonic MIM structure

被引：66

作者：

Li, Zhengfeng ^{[1
]}

Wen, Kunhua ^{[1
]}

Chen, Li ^{[1
]}

Lei, Lang ^{[1
]}

Zhou, Jinyun ^{[1
]}

Zhou, Dongyue ^{[1
]}

Fang, Yihong ^{[1
]}

Wu, Bingye ^{[1
]}

机构：

[1] Guangdong Univ Technol, Sch Phys & Optoelect Engn, Guangzhou 510006, Guangdong, Peoples R China

来源：

APPLIED OPTICS | 2019年 / 58卷 / 18期

基金：

中国国家自然科学基金;

关键词：

WAVE-GUIDE; FILTER;

D O I：

10.1364/AO.58.004878

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A chip-scale refractive index sensor based on multiple Fano resonances is proposed by using a metal-insulator-metal (MIM) structure, which is constructed by two side-coupled semi-ring cavities and a vertical cavity. The finite-difference time-domain method and multimode interference coupled-mode theory are employed to simulate and analyze the transmission spectra of this structure, respectively. First, dual Fano resonances are generated in the MIM structure with a baffle and a semi-ring cavity. By arranging two additional cavities, the mode interferences successfully induce up to six ultra-sharp and asymmetrical Fano peaks. The calculated sensing performances are available with ultra-high sensitivity of 1405 nm/RIU and figure of merit of 3.62 x 10(5). This chip-scale refractive index sensor may have great applications in highly integrated photonic circuits. (C) 2019 Optical Society of America

引用

页码：4878 / 4883

页数：6

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