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Performance improvement of refractometric sensors through hybrid plasmonic-Fano resonances

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Elshorbagy, Mahmoud Hamdy Mohamed and Cuadrado Conde, Alexander and González Contreras, Gabriel and González Contreras, Francisco Javier and Alda, Javier (2019) Performance improvement of refractometric sensors through hybrid plasmonic-Fano resonances. Journal of Lightwave Technology . ISSN 0733-8724 (In Press)

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Official URL: http://dx.doi.org/10.1109/JLT.2019.2906933




Abstract

In this paper, we present a plasmonic refractometric sensor that works under normal incidence; allowing its integration on a fiber tip. The sensor's material and geometry exploit the large scattering cross-section given by high-contrast of the index of refraction subwavelength dielectric gratings. Our design generates a hybrid plasmonic-Fano resonance due to the interference between the surface plasmon resonance and the grating response. We optimize the sensor with a merit function that combines the quality parameter of the resonance and the field enhancement at the interaction volume where the plasmon propagates. Our device shows a high sensitivity (1000 nm/RIU) and a high Figure of Merit (775 RIU−1). Degradation in performance is negligible through a wide dynamic range up to 0.7 RIU. These quantitative parameters overperform compared to similar plasmonic sensors.


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(c) 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works

Uncontrolled Keywords:Plasmonics; Optical sensors; Fano resonances; Gratings; Refractive index; Dynamic range; Plasmons
Subjects:Sciences > Physics > Electromagnetism
Sciences > Physics > Optics
ID Code:54731
Deposited On:08 Apr 2019 07:46
Last Modified:08 Apr 2019 08:59

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