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00925njm 22002777a 4500 dc Hamdy Mohamed Elshorbagy, Mahmoud author San Blas, Alejandro author Sánchez Brea, Luis Miguel author Olaizola, Santiago M. author Del Hoyo Muñoz, Jesús author Soria García, Ángela author Andres Porras, Joaquín author Pastor Villarrubia, Verónica author Alda Serrano, Javier author 2024-10-22 The practical development of compact modern nanophotonic devices relies on the availability of fast and low-cost fabrication techniques applicable to a wide variety of materials and designs. We have engraved a split grating geometry on stainless steel using femtosecond laser processing. This structure serves as a template to fabricate efficient plasmonic sensors, where a thick gold layer is grown conformally on it. The scanning electron microscope (SEM) images confirm the generation of the split laser-induced periodic spatial structures. The optical reflectance of our sensors shows two dips corresponding to the excitation of surface plasmon resonances (SPRs) at two different wavelengths. Furthermore, the asymmetric shape of these spectral responses reveals a strong and narrow Fano resonance. Our computational electromagnetism models accurately reproduce the reflectivity of the fabricated structure. The spectral responses of both the simulated and fabricated structures are fitted to the Fano model that coherently combines the narrow SPRs with the broad continuum background caused by diffraction. The parameters extracted from the fitting, such as the resonance wavelengths and line widths, are used to evaluate the performance of our device as a refractometric sensor for liquids. The maximum sensitivity and figure of merit are 880 nm/RIU and 80 RIU−1, respectively. Besides the compact design of our sensing device, its performance exceeds the theoretical maximum sensitivity of a classical Kretschmann setup. Elshorbagy, M.H., San-Blas, A., Sanchez-Brea, L.M., Olaizola, S.M., Del Hoyo, J., Soria-Garcia, A., Andres-Porras, J., Pastor-Villarrubia, V., Alda, J., 2025. Femto-Laser Processed Metasurface With Fano Response: Applications to a High Performance Refractometric Sensor. Photonic Sens 15, 250228. https://doi.org/10.1007/s13320-024-0736-y 1674-9251 10.1007/s13320-024-0736-y https://hdl.handle.net/20.500.14352/136551 2190-7439 https://doi.org/10.1007/s13320-024-0736-y https://link.springer.com/article/10.1007/s13320-024-0736-y Femto-laser processed metasurface with fano response: applications to a high performance refractometric sensor