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Sensors 2016, 16(5), 642; doi:10.3390/s16050642

Fano Resonance Based on Metal-Insulator-Metal Waveguide-Coupled Double Rectangular Cavities for Plasmonic Nanosensors

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 Eduction, North University of China, No. 3 Xueyuan Road, Taiyuan 030051, China
*
Author to whom correspondence should be addressed.
Academic Editor: Stephane Evoy
Received: 17 February 2016 / Revised: 19 April 2016 / Accepted: 29 April 2016 / Published: 5 May 2016
(This article belongs to the Special Issue Resonator Sensors)
View Full-Text   |   Download PDF [3755 KB, uploaded 6 May 2016]   |  

Abstract

A refractive index sensor based on metal-insulator-metal (MIM) waveguides coupled double rectangular cavities is proposed and investigated numerically using the finite element method (FEM). The transmission properties and refractive index sensitivity of various configurations of the sensor are systematically investigated. An asymmetric Fano resonance lineshape is observed in the transmission spectra of the sensor, which is induced by the interference between a broad resonance mode in one rectangular and a narrow one in the other. The effect of various structural parameters on the Fano resonance and the refractive index sensitivity of the system based on Fano resonance is investigated. The proposed plasmonic refractive index sensor shows a maximum sensitivity of 596 nm/RIU. View Full-Text
Keywords: surface plasmon polaritons; metal-insulator-metal waveguide; Fano resonance; refractive index sensor; finite element method surface plasmon polaritons; metal-insulator-metal waveguide; Fano resonance; refractive index sensor; finite element method
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Zhang, Z.; Luo, L.; Xue, C.; Zhang, W.; Yan, S. Fano Resonance Based on Metal-Insulator-Metal Waveguide-Coupled Double Rectangular Cavities for Plasmonic Nanosensors. Sensors 2016, 16, 642.

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