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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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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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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