We use terahertz time domain spectroscopy to examine finite size effects on the optical phonon modes in SrTiO3 thin films. In temperature-dependent measurements we find a near absence of mode softening in the TO1 phonon frequency. Furthermore we see an increase in the soft mode frequency with reduced thickness. Both of these results correlate well with the reduced dielectric response observed for nanoscale ferroelectric systems.

%B Physica E: Low-dimensional Systems and Nanostructures %V 19 %P 236 - 239 %8 2003/07/01/ %@ 1386-9477 %G eng %U https://www.sciencedirect.com/science/article/pii/S1386947703003059 %N 1 %! Physica E: Low-dimensional Systems and Nanostructures %R 10.1016/S1386-9477(03)00305-9