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Proceedings Paper

Enhanced detection of acousto-photonic scattering using a photorefractive crystal
Author(s): Lei Sui; Todd Murray; Gopi Maguluri; Alex Nieva; Florian Blonigen; Charles DiMarzio; Ronald A. Roy
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Paper Abstract

Acousto-photonic imaging (API) is a dual-wave sensing technique in which a diffusive photon wave in a turbid medium interacts with an imposed acoustic field that drives scatterers to coherent periodic motion. A phase-modulated photon field emanates from the interaction region and carries with it information about the local opto-mechanical properties of the insonated media. A technological barrier to API has been sensitivity - the flux of phase-modulated photons is very small and the incoherence of the resulting speckle pattern reduces the modulation of the scattered light leading to low sensitivity. We report preliminary results from a new detection scheme in which a photorefractive crystal is used to mix the diffusively scattered laser light with a reference beam. The crystal serves as a dynamic holographic medium where the signal beam interferes with the reference beam, creating a photorefractive grating from which beams diffract. In addition, the phase modulation is converted to an amplitude modulation so that the API signal can be detected. Measurements of the API signal are presented for gel phantoms with polystyrene beads used as scatterers, showing a qualitative agreement with a simple theoretical model developed.

Paper Details

Date Published: 12 July 2004
PDF: 8 pages
Proc. SPIE 5320, Photons Plus Ultrasound: Imaging and Sensing, (12 July 2004); doi: 10.1117/12.530348
Show Author Affiliations
Lei Sui, Boston Univ. (United States)
Todd Murray, Boston Univ. (United States)
Gopi Maguluri, Boston Univ. (United States)
Alex Nieva, Northeastern Univ. (United States)
Florian Blonigen, Northeastern Univ. (United States)
Charles DiMarzio, Northeastern Univ. (United States)
Ronald A. Roy, Boston Univ. (United States)

Published in SPIE Proceedings Vol. 5320:
Photons Plus Ultrasound: Imaging and Sensing
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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