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Using an ultrafast optical technique, broadband surface acoustic wave packets are tracked on 1D and 2D phononic crystals in two dimensions in real time at frequencies up to ~1 GHz. The acoustic band structure is obtained from the data by means of a spatiotemporal Fourier transform. We find stop bands for both leaky longitudinal and Rayleigh waves
The wave propagation in anisotropic 3D structures with arbitrary geometries is numerically calculated in order to interpret laser acoustic measurements in microstructures. The laser acoustic Pump-Probe technique generates bulk waves in structures in a thermo elastic way. Here, the wave propagation for various geometries and materials is investigated. In the first part, the wave propagation in isotropic,...
Pulsed laser acoustic experiments have the advantage of very high temporal resolution. However, the lateral resolution amounts to several wavelengths of light. To improve the lateral resolution a focussing tip in which the mechanical waves are focussed is introduced. The combination of high resolution in time and space domain leads to a new potential time resolved scanning probe method. Therefore...
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