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Sensors 2018, 18(1), 116; https://doi.org/10.3390/s18010116

Plasmonic Refractive Index Sensor with High Figure of Merit Based on Concentric-Rings Resonator

1
College of Liberal Arts and Sciences, National University of Defense Technology, Changsha 410073, China
2
Center of Material Science, National University of Defense Technology, Changsha 410073, China
*
Author to whom correspondence should be addressed.
Received: 14 November 2017 / Revised: 19 December 2017 / Accepted: 1 January 2018 / Published: 4 January 2018
(This article belongs to the Special Issue Surface Plasmon Resonance Sensing)
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Abstract

A plasmonic refractive index (RI) sensor based on metal-insulator-metal (MIM) waveguide coupled with concentric double rings resonator (CDRR) is proposed and investigated numerically. Utilizing the novel supermodes of the CDRR, the FWHM of the resonant wavelength can be modulated, and a sensitivity of 1060 nm/RIU with high figure of merit (FOM) 203.8 is realized in the near-infrared region. The unordinary modes, as well as the influence of structure parameters on the sensing performance, are also discussed. Such plasmonic sensor with simple framework and high optical resolution could be applied to on-chip sensing systems and integrated optical circuits. Besides, the special cases of bio-sensing and triple rings are also discussed. View Full-Text
Keywords: plasmonic sensor; high figure of merit; concentric double rings resonator plasmonic sensor; high figure of merit; concentric double rings resonator
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Zhang, Z.; Yang, J.; He, X.; Zhang, J.; Huang, J.; Chen, D.; Han, Y. Plasmonic Refractive Index Sensor with High Figure of Merit Based on Concentric-Rings Resonator. Sensors 2018, 18, 116.

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