Abstract
The symmetry selectivity of phonon Raman spectroscopy of crystalline solids allows for the determination of nano‐crystallographic information in tip‐enhanced Raman scattering (TERS). The selection rules and necessary degrees of freedom arise from the combination of the Raman selection rules reflecting crystal symmetry superimposed by the polarization and k‐vector‐dependent field enhancement and scattering of the scanning probe tip. We demonstrate the identification of intrinsic ferroelectric domains of individual BaTiO3 nanocrystals through selective probing of different transverse optical phonon modes. The technique is generally applicable and structural inhomogeneities, phase transitions, ferroic order occurring on nanometre length scales can be studied.
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