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Proceedings Paper

Photoacoustic concave transmitter for generating high frequency focused ultrasound
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Paper Abstract

We present a photo-acoustic concave transmitter to generate and subsequently focus high frequency ultrasound. Owing to a short time-duration of pulse laser beam, high frequency acoustic waves and tight focusing can be easily achieved. The transmitter consists of a light-absorbing film coated on a concave spherical structure. For detection, we used an optical microring ultrasound detector capable of covering a broadband and high frequency spectrum of photo-acoustic source. A spot width of ~44 μm was obtained at the focal plane. As the finite size and the specific shape of the microring cause a geometrical effect on the detection process, especially for high frequency components, we performed a 2-D spatial signal processing to remove this effect and extract a pure pressure distribution. The aperture for acoustic focusing could be optically controlled by changing the size of pulse laser beam.

Paper Details

Date Published: 23 February 2010
PDF: 5 pages
Proc. SPIE 7564, Photons Plus Ultrasound: Imaging and Sensing 2010, 75642M (23 February 2010); doi: 10.1117/12.841089
Show Author Affiliations
Hyoung Won Baac, Univ. of Michigan (United States)
Tao Ling, Univ. of Michigan (United States)
Shai Ashkenazi, Univ. of Michigan (United States)
Sheng-Wen Huang, Univ. of Michigan (United States)
L. Jay Guo, Univ. of Michigan (United States)

Published in SPIE Proceedings Vol. 7564:
Photons Plus Ultrasound: Imaging and Sensing 2010
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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