Giant optomechanical spring effect in plasmonic nano- and picocavities probed by surface-enhanced Raman scattering.

ABSTRACT: Molecular vibrations couple to visible light only weakly, have small mutual interactions, and hence are often ignored for non-linear optics. Here we show the extreme confinement provided by plasmonic nano- and pico-cavities can sufficiently enhance optomechanical coupling so that intense laser illumination drastically softens the molecular bonds. This optomechanical pumping regime produces strong distortions of the Raman vibrational spectrum related to giant vibrational frequency shifts from an optical spring effect which is hundred-fold larger than in traditional cavities. The theoretical simulations accounting for the multimodal nanocavity response and near-field-induced collective phonon interactions are consistent with the experimentally-observed non-linear behavior exhibited in the Ra

SUBMITTER: Jakob LA 

PROVIDER: S-EPMC10244347 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature