https://doi.org/10.1051/epjconf/202430905009
Maximizing Fluorescence Enhancement in Metal Nanoantenna Arrays for efficient bioanalytical devices
IMM CNR, Istituto per la microelettronica e microsistemi, sezione di Lecce, strada prov.le Lecce-Monteroni, c/o campus Ecotekne, Italy
* Corresponding author: mariagrazia.manera@cnr.it
Published online: 31 October 2024
Our investigation focused on fluorescence enhancement mechanisms using metal nanoantennas with Alexa Fluor-647. By exploiting numerical modelling tools, we fabricated non-interacting Au nanodisc arrays on glass substrates, achieving a maximum fluorescence enhancement factor of 180 at an optimal spacer thickness of approximately 10 nm. Comparative analysis with bare glass substrates revealed significant improvements in excitation and emission dynamics, attributed to nanoscale field confinement and the Purcell effect. Time- and space-resolved photoluminescence measurements unveiled a distance-dependent interaction between the fluorophore and localized plasmons, modulated by thin polyelectrolyte monolayers, with prevalent radiative processes in samples exhibiting maximum signal.
© The Authors, published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
