Fig. 2. TERS Stokes and Anti-Stokes experiments in relation to near field heating and field enhancement.
a Series of Stokes and anti-Stokes TERS spectra simultaneously detected (tacq: 500 ms/spectrum. b Selected spectra with a “fictive temperature” calculated by the Stokes and anti-Stokes ratios according to Eq. 1, i.e., by purposely (i.e., wrongly) assuming that only a Boltzmann thermal population distribution contributes to the Stokes and anti-Stokes relative intensities. c Schematic representation of the three main scenarios for Stokes and anti-Stokes symmetric or anti-symmetric enhancement based on the approximation that only electromagnetic enhancement is affecting the respective intensities