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Theoretical study on the mechanisms of ultrasonic modulation of multiply scattered light

Wang, Lihong V. (2001) Theoretical study on the mechanisms of ultrasonic modulation of multiply scattered light. In: Biomedical Optoacoustics II. Proceedings of SPIE. No.4256. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 208-212. ISBN 9780819439345. https://resolver.caltech.edu/CaltechAUTHORS:20181207-161547607

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Abstract

An analytic model of the ultrasonic modulation of multiply scattered coherent light in scattering media is provided. The model is based on two mechanisms: the ultrasonic modulation of the index of refraction, which causes a modulation of the optical path lengths between consecutive scattering events, and the ultrasonic modulation of the displacements of Rayleigh scatterers, which causes a modulation of optical path lengths upon each scattering event. Multiply scattered light accumulates modulated optical path lengths along its path. Consequently, the intensity of the speckles that are formed by the multiply scattered light is modulated. In water solutions, for example, the contribution from the index of refraction is slightly less than the contribution from displacement when the scattering mean free path is less than a critical fraction of the acoustic wavelength, and it becomes increasingly greater than the contribution from displacement beyond this critical point.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.429309DOIArticle
ORCID:
AuthorORCID
Wang, Lihong V.0000-0001-9783-4383
Additional Information:© 2001 Society of Photo-Optical Instrumentation Engineers (SPIE). This project was sponsored in part by National Science Foundation grant BES-9734491, Texas Higher Education Coordinating Board grant 000512-0123-1999, and National Institutes of Health grants R29 CA68562 and R01 CA71980.
Funders:
Funding AgencyGrant Number
NSFBES-9734491
Texas Higher Education Coordinating Board000512-0123-1999
NIHR29 CA68562
NIHR01 CA71980
Subject Keywords:ultrasonic modulation, optical speckles, multiple scattering, scattering media, random media, turbid media, wave propagation, coherent light, tissue optics, acousto-optics
Series Name:Proceedings of SPIE
Issue or Number:4256
Record Number:CaltechAUTHORS:20181207-161547607
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20181207-161547607
Official Citation:Lihong V. Wang, "Theoretical study on the mechanisms of ultrasonic modulation of multiply scattered light," Proc. SPIE 4256, Biomedical Optoacoustics II, (15 June 2001); doi: 10.1117/12.429309
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91599
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:10 Dec 2018 23:18
Last Modified:03 Oct 2019 20:36

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