2026-08-16T05:34:25Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/131752024-09-04T13:31:00Zcom_20.500.14352_14col_20.500.14352_15

Hamdy Mohamed Elshorbagy, Mahmoud Cuadrado Conde, Alexander González Contreras, Gabriel González Contreras, Francisco Javier Alda, Javier 2023-06-17T13:20:47Z 2023-06-17T13:20:47Z 2019-03-27 0733-8724 DOI 10.1109/JLT.2019.2906933 https://hdl.handle.net/20.500.14352/13175 http://dx.doi.org/10.1109/JLT.2019.2906933 https://ieeexplore.ieee.org/document/8675380 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. eng open access Performance improvement of refractometric sensors through hybrid plasmonic-Fano resonances journal article