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Proceedings Paper

A miniature all-optical photoacoustic imaging probe
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Paper Abstract

A miniature (250 μm outer diameter) photoacoustic probe for endoscopic applications has been developed. It comprises a single delivery optical fibre with a transparent Fabry Perot (FP) ultrasound sensor at its distal end. The fabrication of the sensor was achieved by depositing a thin film multilayer structure comprising a polymer spacer sandwiched between a pair of dichroic dielectric mirrors on to the tip of a single mode fiber. The probe was evaluated in terms of its acoustic bandwidth and sensitivity. Ultra high acoustic sensitivity has been achieved with a concave FP interferometer cavity design, which effectively suppresses the phase dispersion of multiple reflected beam within the cavity to achieve high finesse. The noise equivalent noise (NEP) achieved is 8 Pa over a 20 MHz bandwidth. Backward mode operation of the probe is demonstrated by detecting photoacoustic signals in a variety of phantoms designed to simulate endoscopic applications. A side-viewing probe is also demonstrated illustrating an all-optical design for intravascular imaging applications.

Paper Details

Date Published: 28 February 2011
PDF: 6 pages
Proc. SPIE 7899, Photons Plus Ultrasound: Imaging and Sensing 2011, 78991F (28 February 2011); doi: 10.1117/12.874883
Show Author Affiliations
Edward Z. Zhang, Univ. College London (United Kingdom)
Paul C. Beard, Univ. College London (United Kingdom)


Published in SPIE Proceedings Vol. 7899:
Photons Plus Ultrasound: Imaging and Sensing 2011
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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