Optical Fiber Photonic Crystal Hydrophone for Cellular Acoustic Sensing
Simon Lorenzo, Yu-Po Wong, Olav Solgaard
IEEE Access · 2021
doi:10.1109/access.2021.3066150 (opens in a new tab)
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Abstract
This paper describes the design, characterization, and testing of a compact hydrophone capable of measuring acoustic signals from cardiomyocytes. Our hydrophone consists of a nanofabricated photonic-crystal diaphragm externally-mounted to the facet of an optical fiber to form a pressure-sensitive Fabry-Pérot cavity. Our hydrophone can operate in small liquid volumes less than 5 mm deep and incorporates a microchannel to vent air during immersion. The venting channel is designed to optimize bandwidth and sensitivity. Modeling and experimental results in water show a bandwidth from 50 Hz to 18 kHz and a minimum detectable pressure of <inline-formula> <tex-math notation="LaTeX">$3~\mu Pa/ \sqrt {Hz}$ </tex-math></inline-formula>. We demonstrate the sensitivity to simulated bio-acoustic sources with nanometer-scale displacements.
Abstract licence: CC BY-NC-ND
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