Photoacoustic concave transmitter for generating high frequency focused ultrasound

Hyoung Won Baac; Tao Ling; Shai Ashkenazi; Sheng-Wen Huang; L. Jay Guo

doi:10.1117/12.841089

23 February 2010 Photoacoustic concave transmitter for generating high frequency focused ultrasound

Hyoung Won Baac, Tao Ling, Shai Ashkenazi, Sheng-Wen Huang, L. Jay Guo

Proceedings Volume 7564, Photons Plus Ultrasound: Imaging and Sensing 2010; 75642M (2010) https://doi.org/10.1117/12.841089
Event: SPIE BiOS, 2010, San Francisco, California, United States

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.

Citation Download 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 (23 February 2010); https://doi.org/10.1117/12.841089

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