%0 Journal Article
%A Elshorbagy, Mahmoud Hamdy Mohamed
%A Cuadrado Conde, Alexander
%A González Contreras, Gabriel
%A González Contreras, Francisco Javier
%A Alda, Javier
%T Performance improvement of refractometric sensors through hybrid plasmonic-Fano resonances
%D 2019
%@ 0733-8724
%U https://hdl.handle.net/20.500.14352/13175
%X 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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