Applied Physics Letters · 2008 · 38 citations · 15 references
Biomedical AcousticsEngineeringAcoustic MetamaterialAcoustic SensorPhysical AcousticOptical PropertiesAcoustic CameraBulk Acoustic ResonatorUltrafast LasersAcoustic MethodsPhotonicsAcoustic WavesUltrasonicsUltrafast Laser PhysicsUltrasoundSurface Acoustic ModesFrequency DispersionSpectroscopyApplied PhysicsUltrafast OpticsLaser UltrasoundAcoustic MicroscopyMicromachined Ultrasonic Transducer
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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