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Double-transducer structure for picosecond ultrasound generation

Authors :
En-Yea Pan
Chin-Hsing Kao
Ta-Ching Li
Nen-Wen Pu
Ben-Je Lwo
Source :
Applied Physics Letters. 87:201907
Publication Year :
2005
Publisher :
AIP Publishing, 2005.

Abstract

We report a double-transducer technique for more effective generation of picosecond acoustic waves. A tungsten layer, which is buried under a transparent film and a thin top metal transducer, plays the role of a bottom laser-acoustic transducer as well as a high-impedance acoustic reflector. The pulse shape and the induced piezoreflectance response of the acoustic wave launched by the bottom transducer are different from the conventional top transducer. The effect of the bottom transducer depends on the thicknesses and optical constants of the top transducer and the transparent film. The accuracy of velocity measurement can be raised owing to more efficient energy utilization, halved pulse broadening and attenuation of the tungsten-launched waves, and the added signatures on the reflectance curve.

Details

ISSN :
10773118 and 00036951
Volume :
87
Database :
OpenAIRE
Journal :
Applied Physics Letters
Accession number :
edsair.doi...........3354697e16cbddc47f7f6e2ee6b88360
Full Text :
https://doi.org/10.1063/1.2128692