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A miniature all-optical photoacoustic imaging probe
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BibTeX
@MISC{Zhang_aminiature,
author = {Edward Z. Zhang and Paul C. Beard},
title = {A miniature all-optical photoacoustic imaging probe},
year = {}
}
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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.
Keyphrases
miniature all-optical photoacoustic imaging probe endoscopic application backward mode operation distal end outer diameter acoustic bandwidth concave fp interferometer cavity design phase dispersion noise equivalent noise transparent fabry perot single mode fiber single delivery optical fibre side-viewing probe dichroic dielectric mirror mhz bandwidth multiple reflected beam photoacoustic probe thin film multilayer structure intravascular imaging application ultra high acoustic sensitivity polymer spacer all-optical design photoacoustic signal high finesse ultrasound sensor
