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Proceedings Paper

Interrogation of Fabry-Pérot ultrasound sensors with Bessel beams
Author(s): Oliver J. Sheppard; James A. Guggenheim; Dylan M Marques; Rehman Ansari; Edward Z Zhang; Paul C. Beard; Peter R. T. Munro
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Paper 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 In previous work, the planar geometry of the Fabry-Pérot etalon has been replaced by a curved geometry matched to the interrogation beam geometry, thus preventing walk-off.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.

Paper Details

Date Published: 5 March 2020
PDF: 9 pages
Proc. SPIE 11240, Photons Plus Ultrasound: Imaging and Sensing 2020, 1124014 (5 March 2020);
Show Author Affiliations
Oliver J. Sheppard, Univ. College London (United Kingdom)
James A. Guggenheim, Univ. College London (United Kingdom)
Dylan M Marques, Univ. College London (United Kingdom)
Rehman Ansari, Univ. College London (United Kingdom)
Edward Z Zhang, Univ. College London (United Kingdom)
Paul C. Beard, Univ. College London (United Kingdom)
Peter R. T. Munro, Univ. College London (United Kingdom)

Published in SPIE Proceedings Vol. 11240:
Photons Plus Ultrasound: Imaging and Sensing 2020
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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