Enhanced detection of acousto-photonic scattering using a photorefractive crystal

Lei Sui; Todd Murray; Gopi Maguluri; Alex Nieva; Florian Blonigen; Charles DiMarzio; Ronald A. Roy

doi:10.1117/12.530348

12 July 2004 Enhanced detection of acousto-photonic scattering using a photorefractive crystal

Lei Sui, Todd Murray, Gopi Maguluri, Alex Nieva, Florian Blonigen, Charles DiMarzio, Ronald A. Roy

Proceedings Volume 5320, Photons Plus Ultrasound: Imaging and Sensing; (2004) https://doi.org/10.1117/12.530348
Event: Biomedical Optics 2004, 2004, San Jose, CA, United States

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.

Citation Download Citation

Lei Sui, Todd Murray, Gopi Maguluri, Alex Nieva, Florian Blonigen, Charles DiMarzio, and Ronald A. Roy "Enhanced detection of acousto-photonic scattering using a photorefractive crystal", Proc. SPIE 5320, Photons Plus Ultrasound: Imaging and Sensing, (12 July 2004); https://doi.org/10.1117/12.530348

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available