Real-time imaging of acoustic waves on a bulk acoustic resonator

Fujikura, Takashi; Matsuda, Osamu; Profunser, Dieter M.; Wright, Oliver B.; Masson, Jeremy; Ballandras, Sylvain
December 2008
Applied Physics Letters;12/29/2008, Vol. 93 Issue 26, p261101
Academic Journal
Time resolved images of acoustic waves in the 100 MHz–2.2 GHz range are obtained for an electrically excited thin-film bulk acoustic wave resonator by means of an ultrafast optical technique. Electrical pulses, synchronized to ultrashort laser pulses, piezoelectrically excite the device, and synchronous near-infrared laser pulses interferometrically detect surface motion. The frequency dispersion is extracted using spatiotemporal Fourier transforms, revealing both longitudinal and surface acoustic modes.


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