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Sensors 2017, 17(7), 1494; doi:10.3390/s17071494

Tunable Fano Resonance in Asymmetric MIM Waveguide Structure

Science and Technology on Electronic Test and Measurement Laboratory, North University of China, No. 3 Xueyuan Road, Taiyuan 030051, China
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Received: 5 May 2017 / Revised: 14 June 2017 / Accepted: 20 June 2017 / Published: 25 June 2017
(This article belongs to the Section Physical Sensors)
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Abstract

A plasmonic waveguide coupled system that uses a metal-insulator-metal (MIM) waveguide with two silver baffles and a coupled ring cavity is proposed in this study. The transmission properties of the plasmonic system were investigated using the finite element method. The simulation results show a Fano profile in the transmission spectrum, which was caused by the interaction of the broadband resonance of the Fabry-Perot (F-P) cavity and the narrow band resonance of the ring cavity. The Fabry-Perot (F-P) cavity in this case was formed by two silver baffles dividing the MIM waveguide. The maximum sensitivity of 718 nm/RIU and the maximum figure of merit of 4354 were achieved. Furthermore, the effects of the structural parameters of the F-P cavity and the ring cavity on the transmission properties of the plasmonic system were analyzed. The results can provide a guide for designing highly sensitive on-chip sensors based on surface plasmon polaritons. View Full-Text
Keywords: surface plasmon polaritons; refractive index; Fano resonance; finite element method surface plasmon polaritons; refractive index; Fano resonance; finite element method
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Zhao, X.; Zhang, Z.; Yan, S. Tunable Fano Resonance in Asymmetric MIM Waveguide Structure. Sensors 2017, 17, 1494.

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