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Photonics 2018, 5(3), 23; https://doi.org/10.3390/photonics5030023

Fano Resonance Enhanced Surface Plasmon Resonance Sensors Operating in Near-Infrared

1
School of Mechanical Engineering and Electronic Information, China University of Geosciences (Wuhan), Wuhan 430074, China
2
XLIM Research Institute, UMR 7252 CNRS/University of Limoges, 123, Avenue Albert Thomas, 87060 Limoges CEDEX, France
3
School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 24 July 2018 / Revised: 4 August 2018 / Accepted: 8 August 2018 / Published: 10 August 2018
(This article belongs to the Special Issue Nonlinear Dielectric Photonics and Metasurfaces)
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Abstract

In the phase-sensitivity-based surface plasmon resonance (SPR) sensing scheme, the highest phase jump usually happens at the darkness or quasi-darkness reflection point, which results in low power for detection. To overcome such a limitation, in this paper, a waveguide-coupled SPR configuration is proposed to work at near-infrared. The coupling between surface plasmon polariton (SPP) mode and photonic waveguide (PWG) mode results in electromagnetically induced transparency (EIT) and asymmetric Fano resonance (FR). Near the resonance, the differential phase between p-polarized and s-polarized incident waves experience drastic variation upon change of the surrounding refractive index. More importantly, since the FR occurs at the resonance slope of SPP mode, the corresponding phase change is accompanied with relatively high reflectivity, which is essential for signal-to-noise ratio (SNR) enhancement and power consumption reduction. Phase sensitivity up to 106 deg/RIU order with a minimum SPR reflectivity higher than 20% is achieved. The proposed scheme provides an alternative approach for high-performance sensing applications using FR. View Full-Text
Keywords: surface plasmon resonance; optical sensor; Fano resonance; differential phase surface plasmon resonance; optical sensor; Fano resonance; differential phase
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Huang, T.; Zeng, S.; Zhao, X.; Cheng, Z.; Shum, P.P. Fano Resonance Enhanced Surface Plasmon Resonance Sensors Operating in Near-Infrared. Photonics 2018, 5, 23.

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