Ultrafast spatio-temporal mapping of gigahertz lattice distortion in a ferroelectric crystal
(Conference Presentation)

Venkatraman Gopalan; Yakun Yuan

doi:10.1117/12.2238307

2 November 2016 Ultrafast spatio-temporal mapping of gigahertz lattice distortion in a ferroelectric crystal (Conference Presentation)

Venkatraman Gopalan, Yakun Yuan

Author Affiliations +

Proceedings Volume 9956, Ultrafast Nonlinear Imaging and Spectroscopy IV; 99560S (2016) https://doi.org/10.1117/12.2238307
Event: SPIE Optical Engineering + Applications, 2016, San Diego, California, United States

Abstract

We capture the spatio-temporal oscillations within large individual ferroelectric domains and across domain walls upon optical excitation in a single crystal of BaTiO3 with ~350 nm lateral resolution and ~100 ps temporal resolution using synchrotron x-ray pulses as probes. Spatially resolved ultrafast mapping across domain walls reveals that the optical excitation pump can generate GHz acoustic standing waves of different frequencies between the surface and buried domain wall interfaces at different depths. Phase-field simulations reveal that a thermo-electro-acoustic mechanism can quantitatively explain the observed dynamics. The study reveals the importance of combined spatial and temporal resolution for understanding ultrafast dynamics in inhomogeneous microstructures.

Conference Presentation

Citation Download Citation

Venkatraman Gopalan and Yakun Yuan "Ultrafast spatio-temporal mapping of gigahertz lattice distortion in a ferroelectric crystal (Conference Presentation)", Proc. SPIE 9956, Ultrafast Nonlinear Imaging and Spectroscopy IV, 99560S (2 November 2016); https://doi.org/10.1117/12.2238307

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