Preprint Article Version 1 This version is not peer-reviewed

Refractive Index Sensor Based on Metal–Insulator–Metal Waveguide Coupled with Symmetric Structure

Version 1 : Received: 4 December 2017 / Approved: 4 December 2017 / Online: 4 December 2017 (16:44:13 CET)

A peer-reviewed article of this Preprint also exists.

Yan, S.; Zhang, M.; Zhao, X.; Zhang, Y.; Wang, J.; Jin, W. Refractive Index Sensor Based on a Metal–Insulator–Metal Waveguide Coupled with a Symmetric Structure. Sensors 2017, 17, 2879. Yan, S.; Zhang, M.; Zhao, X.; Zhang, Y.; Wang, J.; Jin, W. Refractive Index Sensor Based on a Metal–Insulator–Metal Waveguide Coupled with a Symmetric Structure. Sensors 2017, 17, 2879.

Journal reference: Sensors 2017, 17, 2879
DOI: 10.3390/s17122879

Abstract

In this study, we design a new refractive index sensor based on a metal–insulator–metal waveguide coupled with a notched ring and vertical rectangular resonators. We use the finite element method to study the propagation characteristics of the sensor. According to the calculation results, the transmission spectrum exhibits a typical Fano resonance shape. The phenomenon of Fano resonance is caused by the coupling between the wide spectrum and narrow spectrum. In the design, the wide spectrum signal is generated by the vertical rectangular resonator, while the narrow spectrum signal is generated by the notched ring resonator. In addition, we varied the structural parameters of the resonators and filled the structure with media of different refractive indices to study the sensing properties. The maximum achieved sensitivity of the sensor reached 1071.4 nm/RIU. The results reveal potential applications of the coupled system in the field of sensors.

Subject Areas

surface plasmon polaritons; Fano resonance; finite element method; refractive index sensor

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