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Sensors 2016, 16(10), 1730; doi:10.3390/s16101730

High Quality Plasmonic Sensors Based on Fano Resonances Created through Cascading Double Asymmetric Cavities

Department of Physics, South University of Science and Technology of China, Shenzhen 518055, China
Author to whom correspondence should be addressed.
Academic Editor: Stephane Evoy
Received: 17 August 2016 / Revised: 3 October 2016 / Accepted: 12 October 2016 / Published: 18 October 2016
(This article belongs to the Special Issue Resonator Sensors)
View Full-Text   |   Download PDF [3237 KB, uploaded 18 October 2016]   |  


In this paper, a type of compact nanosensor based on a metal-insulator-metal structure is proposed and investigated through cascading double asymmetric cavities, in which their metal cores shift along different axis directions. The cascaded asymmetric structure exhibits high transmission and sharp Fano resonance peaks via strengthening the mutual coupling of the cavities. The research results show that with the increase of the symmetry breaking in the structure, the number of Fano resonances increase accordingly. Furthermore, by modulating the geometrical parameters appropriately, Fano resonances with high sensitivities to the changes in refractive index can be realized. A maximum figure of merit (FoM) value of 74.3 is obtained. Considerable applications for this work can be found in bio/chemical sensors with excellent performance and other nanophotonic integrated circuit devices such as optical filters, switches and modulators. View Full-Text
Keywords: reflective index sensor; plasmonics; Fano resonance; metal-insulator-metal waveguide reflective index sensor; plasmonics; Fano resonance; metal-insulator-metal waveguide

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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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Zhang, X.; Shao, M.; Zeng, X. High Quality Plasmonic Sensors Based on Fano Resonances Created through Cascading Double Asymmetric Cavities. Sensors 2016, 16, 1730.

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