Polarization properties of oblique incidence scanning tunneling microscopy-tip-enhanced Raman spectroscopy.
We used scanning tunneling microscopy-tip-enhanced Raman spectroscopy (STM-TERS) to study the polarization properties of near-field scattering on a crystalline material as well as on a dye adsorbate. The measurements on a (111)-oriented c-Si sample were found to be well described by a recently proposed model for TERS and allowed for a characterization of the polarization properties of the tips used. The tip enhancement was stronger for excitation radiation having a field component along the tip axis for both types of samples. A non-negligible enhancement was also found for the field component perpendicular to the tip axis.
Picardi
Gennaro
G
LPICM, Ecole Polytechnique, CNRS, 91128 Palaiseau, France; HORIBA Jobin Yvon SAS, Raman Division, 231 rue de Lille, 59650 Villeneuve d'Ascq, France. picardi@polytechnique.edu
Nguyen
Quang
Q
Ossikovski
Razvigor
R
Schreiber
Joachim
J