Plasmonic Sensors Based on Funneling Light Through Nanophotonic Structures


We present a refractometric sensor realized as a stack of metallic gratings with subwavelength features and embedded within a low-index dielectric medium. Light is strongly confined through funneling mechanisms and excites resonances that sense the analyte medium. Two terminations of the structure are compared. One of them has a dielectric medium in contact with the analyte and exploits the selective spectral transmission of the structure. The other design has a metallic continuous layer that generates surface plasmon resonances at the metal/analyte interface. Both designs respond with narrow spectral features that are sensible to the change in the refractive index of the analyte and can be used for sensing biomedical samples.

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This work was partially supported by the Egyptian Ministry of Higher Education missions section.

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Correspondence to Javier Alda.

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Elshorbagy, M.H., Cuadrado, A. & Alda, J. Plasmonic Sensors Based on Funneling Light Through Nanophotonic Structures. Plasmonics 15, 915–921 (2020).

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  • Nanophotonics
  • Plasmonics
  • Optical sensors
  • Refractometry