Orientation-resolved domain mapping in tetragonal SrTiO3 using polarized Raman spectroscopy

We present microscopically resolved, polarized spectroscopy of Raman scattering collected from tetragonal ${\mathrm{SrTiO}}₃$. The anisotropic response of first-order Raman peaks within a single tetragonal domain has been measured. From these data, we assign symmetries to the phonons seen in the first-order Raman spectrum which is normally complicated by uncontrolled domain structure. Using a translation stage, we map the local domain orientation of a $3\text{\ensuremath{-}}\ensuremath{\mu}{\mathrm{m}}³$ crystal volume near the laser focus and compare it to wide-field polarized images. This technique can be performed with readily available instruments and is relevant to the study of a wide range of related materials, interfaces, and devices.