A polyimide-etalon thin film structure for all-optical high-frequency ultrasound transduction

@article{Sheaff2012APT,
  title={A polyimide-etalon thin film structure for all-optical high-frequency ultrasound transduction},
  author={Clay Sheaff and Shai Ashkenazi},
  journal={IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control},
  year={2012},
  volume={59}
}
In this work, we have designed, fabricated, and tested an all-optical ultrasound transducer by integrating a photoabsorptive polyimide thin film into a Fabry-Pérot (etalon) high-frequency receiver. A 5-ns UV pulse was used for thermoelastic ultrasound generation in the polyimide film, and the transmission had a maximum amplitude of 4.3 MPa centered at 27 MHz with a fractional bandwidth of 107%. The device attained a noise-equivalent pressure of 1.3 Pa/ Hz in receive-only mode. When used in… CONTINUE READING
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