We demonstrate selective excitation of nanocavity modes controlled by the polarization and frequency of a laser beam. More precisely, we record confocal maps of Raman scattering excited by cylindrical vector beams, which are compared to the known excitation near-field patterns. Our measurements reveal the transverse vs. longitudinal polarization of the excited antenna mode and how the input coupling rate depends on laser wavelength. The method introduced here is easily applicable to other experimental scenarios, and our results help connect far-field with near-field parameters in quantitative models of nanocavity-enhanced phenomena.
Reference: “Mode-Specific Coupling of Nanoparticle-on-Mirror Cavities with Cylindrical Vector Beams” Valeria Vento, Philippe Roelli, Sachin Verlekar, and Christophe Galland, Nano Lett. 2023, 23, 11, 4885–4892, Publication Date: May 19, 2023;