AbstractThe Raman depolarization ratio is a quantity
that can be easily measured experimentally and offers
unique information on the Raman polarizability tensor
of molecular vibrations. In Surface Enhanced Raman
Scattering (SERS), molecules are near-field coupled with
optical nanoantennas and their scattering properties
are strongly affected by the radiation patterns of the
nanoantenna. The polarization of the SERS photons is
consequently modified, affecting, in a non trivial way, the
measured value of the SERS depolarization ratio. In this
article we elaborate a model that describes how the SERS
depolarization ratio is influenced by the nanoantenna
re-radiation properties, suggesting how to retrieve
information on the Raman polarizability from SERS
experiments.
Optical Nanoantennas with Tunable Radiation Patterns