Enhanced detection of acousto-photonic scattering using a photorefractive crystal

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 inf...

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Main Authors: Sui, L, Murray, T, Maguluri, G, Nieva, A, Blonigen, F, DiMarzio, C, Roy, R
Format: Conference item
Published: Society of Photo-optical Instrumentation Engineers 2004
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author Sui, L
Murray, T
Maguluri, G
Nieva, A
Blonigen, F
DiMarzio, C
Roy, R
author_facet Sui, L
Murray, T
Maguluri, G
Nieva, A
Blonigen, F
DiMarzio, C
Roy, R
author_sort Sui, L
collection OXFORD
description 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.
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spelling oxford-uuid:c62a4cd0-ac4b-4c44-9193-e6b0e64b1fdc2022-03-27T06:36:17ZEnhanced detection of acousto-photonic scattering using a photorefractive crystalConference itemhttp://purl.org/coar/resource_type/c_5794uuid:c62a4cd0-ac4b-4c44-9193-e6b0e64b1fdcSymplectic Elements at OxfordSociety of Photo-optical Instrumentation Engineers2004Sui, LMurray, TMaguluri, GNieva, ABlonigen, FDiMarzio, CRoy, RAcousto-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.
spellingShingle Sui, L
Murray, T
Maguluri, G
Nieva, A
Blonigen, F
DiMarzio, C
Roy, R
Enhanced detection of acousto-photonic scattering using a photorefractive crystal
title Enhanced detection of acousto-photonic scattering using a photorefractive crystal
title_full Enhanced detection of acousto-photonic scattering using a photorefractive crystal
title_fullStr Enhanced detection of acousto-photonic scattering using a photorefractive crystal
title_full_unstemmed Enhanced detection of acousto-photonic scattering using a photorefractive crystal
title_short Enhanced detection of acousto-photonic scattering using a photorefractive crystal
title_sort enhanced detection of acousto photonic scattering using a photorefractive crystal
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