title: A Refractive Index Sensor Based on a Metal-Insulator-Metal Waveguide-Coupled Ring Resonator.
abstract: A refractive index sensor composed of two straight metal-insulator-metal waveguides and a ring resonator is presented. One end of each straight waveguide is sealed and the other end acts as port. The transmission spectrum and magnetic field distribution of this sensor structure are simulated using finite-difference time-domain method (FDTD). The results show that an asymmetric line shape is observed in the transmission spectrum, and that the transmission spectrum shows a filter-like behavior. The quality factor and sensitivity are taken to characterize its sensing performance and filter properties. How structural parameters affect the sensing performance and filter properties is also studied.
authors.affiliation: Science and Technology on Electronic Test &amp;Measurement Laboratory, North University of China, No.3 Xueyuan Road, Taiyuan 030051, China. shubin_yan@nuc.edu.cn.|Key Laboratory of Instrumentation Science &amp; Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China, No.3 Xueyuan Road, Taiyuan 030051, China. shubin_yan@nuc.edu.cn.
authors.forename: Shu-Bin
authors.initials: SB
authors.lastname: Yan
authors.affiliation: Science and Technology on Electronic Test &amp;Measurement Laboratory, North University of China, No.3 Xueyuan Road, Taiyuan 030051, China. luoliang6616@sina.cn.|Key Laboratory of Instrumentation Science &amp; Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China, No.3 Xueyuan Road, Taiyuan 030051, China. luoliang6616@sina.cn.
authors.forename: Liang
authors.initials: L
authors.lastname: Luo
authors.affiliation: Science and Technology on Electronic Test &amp;Measurement Laboratory, North University of China, No.3 Xueyuan Road, Taiyuan 030051, China. xuechenyang@nuc.edu.cn.|Key Laboratory of Instrumentation Science &amp; Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China, No.3 Xueyuan Road, Taiyuan 030051, China. xuechenyang@nuc.edu.cn.
authors.forename: Chen-Yang
authors.initials: CY
authors.lastname: Xue
authors.affiliation: Science and Technology on Electronic Test &amp;Measurement Laboratory, North University of China, No.3 Xueyuan Road, Taiyuan 030051, China. zdzhang@nuc.edu.cn.|Key Laboratory of Instrumentation Science &amp; Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China, No.3 Xueyuan Road, Taiyuan 030051, China. zdzhang@nuc.edu.cn.
authors.forename: Zhi-Dong
authors.initials: ZD
authors.lastname: Zhang
keywords: Fano resonance; finite-difference time-domain method; metal-insulator-metal waveguide; refractive index sensor; surface plasmon polaritons