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Refractive Index Dependence of Fluorescence Enhancement in a Nanostructured Plasmonic Grating.

Margherita AngeliniEliana ManobiancoPaola PellacaniFrancesco FlorisFranco Marabelli
Published in: Materials (Basel, Switzerland) (2023)
Plasmonic gratings are attracting huge interest in the context of realizing sensors based on surface-enhanced fluorescence. The grating features control the plasmonic modes and consequently have a strong effect on the fluorescence response. Within this framework, we focused on the use of a buffer solution flowing across the grating active surface to mimic a real measurement. The refractive index of the surrounding medium is therefore altered, with a consequent modification of the resonance conditions. The result is a shift in the spectral features of the fluorescence emission accompanied by a reshaping of the fluorescence emission in terms of spectral weight and direction.
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