23 December 2011 Dynamic imaging of surface acoustic waves in phononic crystals
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Using ultrashort pulsed optical excitation and interferometric detection, we image ultrahigh- frequency surface acoustic waves on two-dimensional (2D) phononic crystals in the time domain. The samples consist of a square lattice of airfilled holes etched in a silicon substrate. Good agreement with time-domain finite element numerical simulations is obtained. The dispersion relation is derived and stop bands are revealed by means of Fourier transforms. The wave fields corresponding to acoustic eigenmodes at specific frequencies are also presented.
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Oliver B. Wright, Oliver B. Wright, István A. Veres, István A. Veres, Dieter M. Profunser, Dieter M. Profunser, Osamu Matsuda, Osamu Matsuda, Brian Culshaw, Brian Culshaw, Udo Lang, Udo Lang, } "Dynamic imaging of surface acoustic waves in phononic crystals", Proc. SPIE 8204, Smart Nano-Micro Materials and Devices, 820425 (23 December 2011); doi: 10.1117/12.905005; https://doi.org/10.1117/12.905005

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