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Sensors 2015, 15(11), 29183-29191; doi:10.3390/s151129183

A Refractive Index Sensor Based on a Metal-Insulator-Metal Waveguide-Coupled Ring Resonator

1
Science and Technology on Electronic Test &Measurement Laboratory, North University of China, No.3 Xueyuan Road, Taiyuan 030051, China
2
Key Laboratory of Instrumentation Science & Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China, No.3 Xueyuan Road, Taiyuan 030051, China
*
Author to whom correspondence should be addressed.
Academic Editor: Lorenzo Pavesi
Received: 26 August 2015 / Revised: 16 November 2015 / Accepted: 16 November 2015 / Published: 19 November 2015
(This article belongs to the Special Issue Silicon Based Optical Sensors)
View Full-Text   |   Download PDF [848 KB, uploaded 19 November 2015]   |  

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. View Full-Text
Keywords: surface plasmon polaritons; metal-insulator-metal waveguide; Fano resonance; refractive index sensor; finite-difference time-domain method surface plasmon polaritons; metal-insulator-metal waveguide; Fano resonance; refractive index sensor; finite-difference time-domain method
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yan, S.-B.; Luo, L.; Xue, C.-Y.; Zhang, Z.-D. A Refractive Index Sensor Based on a Metal-Insulator-Metal Waveguide-Coupled Ring Resonator. Sensors 2015, 15, 29183-29191.

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