@inproceedings{af55362f5dba4286ab6d668cbe014213,
title = "Polyimide-etalon all-optical ultrasound transducer for high frequency applications",
abstract = "We have enhanced our design for an all-optical high frequency ultrasound transducer consisting of a UV-absorbing polyimide film integrated into an etalon receiver operating in the NIR range. A dielectric stack having high NIR reflectivity and high UV transmittance was chosen as the first mirror for increased sensitivity and the allowance of polyimide as the etalon medium. A 13 ns, 0.7 μJ optical pulse at 355 nm and a continuous-wave NIR laser were focused onto the structure with a spot diameter of 120 and 35 μm, respectively. In receive mode the etalon had a noise-equivalent pressure of 4.1 kPa over a bandwidth of 5 - 50 MHz (0.61 Pa/√Hz). The device generated a pressure of 270 kPa at a depth of 200 μm, and the -3 dB bandwidth of the emission extended from 27 to 60 MHz. In transmit/receive mode, the pulse-echo had a center frequency of 35 MHz with a -6 dB bandwidth of 49 MHz (140 %). Lastly, wire targets were imaged by scanning the UV spot to create a synthetic aperture of transmitters centered upon a single receiver.",
keywords = "Etalon, Fabry-Perot, Photoacoustic, Thermoelastic, Ultrasound",
author = "Clay Sheaff and Shai Ashkenazi",
year = "2014",
doi = "10.1117/12.2040230",
language = "English (US)",
isbn = "9780819498564",
series = "Progress in Biomedical Optics and Imaging - Proceedings of SPIE",
publisher = "SPIE",
booktitle = "Photons Plus Ultrasound",
address = "United States",
note = "Photons Plus Ultrasound: Imaging and Sensing 2014 ; Conference date: 02-02-2014 Through 05-02-2014",
}