Molecular saturation determines distinct plasmonic enhancement scenarios for two-photon absorption signal.

ABSTRACT: Two-photon absorption in molecules, of significance for high-resolution imaging applications, is typically characterised with low cross sections. To enhance the TPA signal, one effective approach exploits plasmonic enhancement. For this method to be efficient, it must meet several criteria, including broadband operational capability and a high fluorescence rate to ensure effective signal detection. In this context, we introduce a plus-shaped silver nanostructure designed to exploit the coupling of bright and dark plasmonic modes. This configuration considerably improves both the absorption and fluorescence of molecules across near-infrared and visible spectra. By fine-tuning the geometrical parameters of the nanostructure, we align the plasmonic resonances with the optical properties of sp

SUBMITTER: Izadshenas Jahromi S 

PROVIDER: S-EPMC11785770 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature