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Sensors 2017, 17(4), 784; doi:10.3390/s17040784

Refractive Index Sensor Based on Fano Resonances in Metal-Insulator-Metal Waveguides Coupled with Resonators

1
Science and Technology on Electronic Test and Measurement Laboratory, North University of China, No. 3 Xueyuan Road, Taiyuan 030051, China
2
Ghent University Global Campus, Department of Applied Analytical and Physical Chemistry, Faculty of Bioscience Engineering, 119 Songdo Munhwa-ro, Yeonsu-Gu, Incheon 406-840, Korea
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editors: Jikui Luo, Weipeng Xuan and Richard Y. Q. Fu
Received: 21 February 2017 / Revised: 25 March 2017 / Accepted: 4 April 2017 / Published: 6 April 2017
(This article belongs to the Special Issue Acoustic Wave Resonator-Based Sensors)
View Full-Text   |   Download PDF [2885 KB, uploaded 6 April 2017]   |  

Abstract

A surface plasmon polariton refractive index sensor based on Fano resonances in metal–insulator–metal (MIM) waveguides coupled with rectangular and ring resonators is proposed and numerically investigated using a finite element method. Fano resonances are observed in the transmission spectra, which result from the coupling between the narrow-band spectral response in the ring resonator and the broadband spectral response in the rectangular resonator. Results are analyzed using coupled-mode theory based on transmission line theory. The coupled mode theory is employed to explain the Fano resonance effect, and the analytical result is in good agreement with the simulation result. The results show that with an increase in the refractive index of the fill dielectric material in the slot of the system, the Fano resonance peak exhibits a remarkable red shift, and the highest value of sensitivity (S) is 1125 nm/RIU, RIU means refractive index unit. Furthermore, the coupled MIM waveguide structure can be integrated with other photonic devices at the chip scale. The results can provide a guide for future applications of this structure. View Full-Text
Keywords: plasmonic refractive index sensor; finite element method; Fano resonance; coupled-mode theory plasmonic refractive index sensor; finite element method; Fano resonance; coupled-mode theory
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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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Tang, Y.; Zhang, Z.; Wang, R.; Hai, Z.; Xue, C.; Zhang, W.; Yan, S. Refractive Index Sensor Based on Fano Resonances in Metal-Insulator-Metal Waveguides Coupled with Resonators. Sensors 2017, 17, 784.

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