From Event: SPIE Optical Engineering + Applications, 2016
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.
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 (Presented at SPIE Optical Engineering + Applications: August 29, 2016; Published: 2 November 2016); https://doi.org/10.1117/12.2238307.5186291903001.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon