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Interrogation of Fabry-Pérot ultrasound sensors with Bessel beams

Sheppard, OJ; Guggenheim, JA; Marques, DM; Ansari, R; Zhang, EZ; Beard, PC; Munro, PRT; (2020) Interrogation of Fabry-Pérot ultrasound sensors with Bessel beams. In: Proceedings of SPIE: Photons Plus Ultrasound: Imaging and Sensing 2020. SPIE: San Francisco, California, USA. Green open access

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Abstract

Fabry-Pérot etalon-based ultrasound detectors are typically interrogated with a focused Gaussian beam in order to achieve a desired acoustic element size. However, tightly focused Gaussian beams lead to beam †walk-off' within the etalon cavity which reduces sensitivity. In previous work, the planar geometry of the Fabry-Pérot etalon has been replaced by a curved geometry matched to the interrogation beam geometry, thus preventing walk-off. In this work we instead propose using propagation invariant Bessel beams, thus matching the beam geometry to that of the planar etalon geometry, to reduce beam walk-off and increase sensitivity. Increased sensitivity may extend the imaging depth of Fabry-Pérot ultrasound detection systems and may thus enable photoacoustic imaging to access a range of deep tissue imaging applications.

Type: Proceedings paper
Title: Interrogation of Fabry-Pérot ultrasound sensors with Bessel beams
Event: SPIE BiOS, 2020
Open access status: An open access version is available from UCL Discovery
DOI: 10.1117/12.2551305
Publisher version: https://doi.org/10.1117/12.2551305
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10100653
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