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We investigate experimentally and by numerical simulation the interaction between ultrahigh frequency surface acoustic waves (SAW) and periodic microstructures. We use both one-dimensional (1D) phononic crystals consisting of copper lines embedded in silicon oxide and 2D phononic crystals consisting of air-filled holes etched as a square lattice in a silicon substrate. Experimental results obtained by ultrashort pulsed optical excitation and interferometric detection are compared to time-domain finite element (FEM) simulations of the propagating ultrahigh frequency SAW with frequency components up to ~1 GHz in these phononic crystals, allowing the investigation of SAW scattering and phononic band structure. Good agreement was obtained between simulation and experiment.
|Number of pages||4|
|Publication status||Published - Sep 2009|
|Event||2009 IEEE Ultrasonics Symposium - Rome, Italy|
Duration: 20 Sep 2009 → 23 Sep 2009
|Conference||2009 IEEE Ultrasonics Symposium|
|Period||20/09/09 → 23/09/09|
- ultrahigh frequency surface waves
- phononic crystals
- periodic microstructures
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- 1 Finished
1/01/08 → 31/10/11