A Plasmonic Refractive-Index Sensor Based Multiple Fano Resonance Multiplexing in Slot-Cavity Resonant System  

作　　者：Zicong GUO Kunhua WEN Yuwen QIN Yihong FANG Zhengfeng LI Li CHEN 

机构地区：[1]School of Physics and Optoelectronic Engineering,Guangdong University of Technology,Guangzhou 510006,China [2]School of Information Engineering,Guangdong University of Technology,Guangzhou 510006,China

出　　处：《Photonic Sensors》2022年第2期175-184,共10页光子传感器（英文版）

摘　　要：In this paper,a sub-wavelength metal-insulator-metal(MIM)waveguide structure is proposed by using a cross-shape rectangular cavity,of which wings are coupled with two rectangular cavities.Firstly,a cross-shape rectangular cavity is placed between the input and output MIM waveguides.According to the mutual interference between bright and dark modes,three Fano resonant peaks are generated.Secondly,by adding a rectangular cavity on the left wing of the cross shaped one,five asymmetric Fano resonance peaks are obtained.Thirdly,six asymmetric Fano resonance peaks are achieved after adding another cavity on the right wing.Finally,the finite-difference-time-domain(FDTD)method and multimode interference coupled-mode theory(MICMT)are used to simulate and analyze the coupled plasmonic resonant system,respectively.The highest sensitivity of 1 OOOnm/RIU is achieved.

关 键 词：SUB-WAVELENGTH MIM waveguide Fano resonance 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]