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Uncovering low-frequency vibrations in surface-enhanced Raman of organic molecules

2024; Nature Portfolio; Volume: 15; Issue: 1 Linguagem: Inglês

10.1038/s41467-024-50823-x

2041-1723

Alexandra Boehmke Amoruso, Roberto A. Boto, Eoin Elliot, Bart de Nijs, Rubén Esteban, Tamás Földes, Fernando Aguilar‐Galindo, Edina Rosta, Javier Aizpurua, Jeremy J. Baumberg,

Spectroscopy Techniques in Biomedical and Chemical Research

Accessing the terahertz (THz) spectral domain through surface-enhanced Raman spectroscopy (SERS) is challenging and opens up the study of low-frequency molecular and electronic excitations. Compared to direct THz probing of heterogenous ensembles, the extreme plasmonic confinement of visible light to deep sub-wavelength scales allows the study of hundreds or even single molecules. We show that self-assembled molecular monolayers of a set of simple aromatic thiols confined inside single-particle plasmonic nanocavities can be distinguished by their low-wavenumber spectral peaks below 200 cm