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Proceedings Article

Photoacoustic concave transmitter for generating high frequency focused ultrasound

[+] Author Affiliations
Hyoung Won Baac, Tao Ling, Shai Ashkenazi, Sheng-Wen Huang, L. Jay Guo

Univ. of Michigan (USA)

Proc. SPIE 7564, Photons Plus Ultrasound: Imaging and Sensing 2010, 75642M (February 23, 2010); doi:10.1117/12.841089
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From Conference Volume 7564

  • Photons Plus Ultrasound: Imaging and Sensing 2010
  • Alexander A. Oraevsky; Lihong V. Wang
  • San Francisco, California | January 23, 2010

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.

© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Hyoung Won Baac ; Tao Ling ; Shai Ashkenazi ; Sheng-Wen Huang and L. Jay Guo
"Photoacoustic concave transmitter for generating high frequency focused ultrasound", Proc. SPIE 7564, Photons Plus Ultrasound: Imaging and Sensing 2010, 75642M (February 23, 2010); doi:10.1117/12.841089; http://dx.doi.org/10.1117/12.841089


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