Gigahertz Opto-Acoustics using Guided-Wave Nanophotonics

date April 12, 2013
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Friday, April 12, 2013 4:00 p.m. in ETC 4.150

Professor Zheng Wang
Department of Electrical & Computer Engineering
The University of Texas at Austin
www.ece.utexas.edu/

Coherent acoustic waves at ultrahigh frequencies (5‑100GHz) promise a wide range of on-chip applications, from microwave signal buffering/processing to nano‑imaging. We produce such ultrahigh frequency acoustic waves using guided‑wave nanophotonic structures that strongly couple optical signals with acoustic signals. We explore nano‑structures capable of maximizing coherent acoustic phonon generation through a combination of radiation pressure and electrostriction. Experimental observation of such opto‑acoustic effects in silicon waveguides, manifests as stimulated Brillouin scattering, producing radically enhanced and tailorable third order nonlinearities.