Experimental verification of field-enhanced molecular vibrational scattering at single infrared antennas.

ABSTRACT: Surface-enhanced infrared absorption (SEIRA) spectroscopy exploits the field enhancement near nanophotonic structures for highly sensitive characterization of (bio)molecules. The vibrational signature observed in SEIRA spectra is typically interpreted as field-enhanced molecular absorption. Here, we study molecular vibrations in the near field of single antennas and show that the vibrational signature can be equally well explained by field-enhanced molecular scattering. Although the infrared scattering cross section of molecules is negligible compared to their absorption cross section, the interference between the molecular-scattered field and the incident field enhances the spectral signature caused by molecular vibrational scattering by 10 orders of magnitude, thus becoming as large as t

SUBMITTER: Virmani D 

PROVIDER: S-EPMC11310513 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature