Spatially-Localized Functionalization on Nanostructured Surfaces for Enhanced Plasmonic Sensing Efficacy

Jean-François Bryche (1, 2) , Marlo Vega (1, 2, 3) , Agnès Tempez (4) , Thibault Brulé (4) , Thomas Carlier (4) , Julien Moreau (3) , Marc Chaigneau (4) , Paul Charette (1, 2) , Michael Canva (1, 2)

1 LN2 - Laboratoire Nanotechnologies et Nanosystèmes [Sherbrooke]
2 3IT - Institut Interdisciplinaire d'Innovation Technologique [Sherbrooke]
3 Laboratoire Charles Fabry / Biophotonique
4 HORIBA France SAS [Longjumeau]

This work demonstrates the enhancement in plasmonic sensing efficacy resulting from spatially-localized functionalization on nanostructured surfaces, whereby probe molecules are concentrated in areas of high field concentration. Comparison between SERS measurements on nanostructured surfaces (arrays of nanodisks 110 and 220 nm in diameter) with homogeneous and spatially-localized functionalization with thiophenol demonstrates that the Raman signal originates mainly from areas with high field concentration. TERS measurements with 10 nm spatial resolution confirm the field distribution profiles predicted by the numerical modeling. Though this enhancement in plasmonic sensing efficacy is demonstrated with SERS, results apply equally well to any type of optical/plasmonic sensing on functionalized surfaces with nanostructuring.

Domaines: Micro et nanotechnologies/Microélectronique

Jean-François Bryche, Marlo Vega, Agnès Tempez, Thibault Brulé, Thomas Carlier, et al.. Spatially-Localized Functionalization on Nanostructured Surfaces for Enhanced Plasmonic Sensing Efficacy. Nanomaterials, 2022, 12 (20), pp.3586. ⟨10.3390/nano12203586⟩. ⟨hal-03815795⟩