@inproceedings{6c2b0cfb9c714cf4af340190b4c13764,
title = "Photo-acoustic concave transmitter for generating high frequency focused ultrasound",
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.",
keywords = "Acoustic focusing, High frequency ultrasound, Microring resonator, Photo-acoustic generation",
author = "Baac, {Hyoung Won} and Tao Ling and Shai Ashkenazi and Huang, {Sheng Wen} and Guo, {L. Jay}",
year = "2010",
doi = "10.1117/12.841089",
language = "English (US)",
isbn = "9780819479600",
series = "Progress in Biomedical Optics and Imaging - Proceedings of SPIE",
booktitle = "Photons Plus Ultrasound",
note = "Photons Plus Ultrasound: Imaging and Sensing 2010 ; Conference date: 24-01-2010 Through 26-01-2010",
}