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Proceedings Paper

Focusing of light through scattering media
Author(s): Fanting Kong; Ronald Silverman; Liping Liu; Parag V. Chitnis; Y. C. Chen
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Paper Abstract

Convergence of light towards a desired location in optically diffusive and aberrative media is highly relevant to optical methods of biomedical imaging. In this study, we demonstrated the feasibility of employing photoacoustic signals originating from an optically absorptive target as feedback for shaping the incident wavefront to increase optical energy density at the absorptive target. The wavefront of a collimated laser beam was shaped by an array of two-dimensional MEMS deformable mirrors and then transmitted through optically scattering paraffin. The phase of light reflected by each mirror was varied (0-2π) iteratively to maximize the amplitude of the photoacoustic signal. The photoacoustic signal potentially provides a non-invasive and reliable feedback for manipulating spatial phase distribution of light to achieve focusing in diffusive media and may facilitate optical imaging at greater depths.

Paper Details

Date Published: 18 February 2011
PDF: 6 pages
Proc. SPIE 7899, Photons Plus Ultrasound: Imaging and Sensing 2011, 789925 (18 February 2011); doi: 10.1117/12.873836
Show Author Affiliations
Fanting Kong, Hunter College of the City Univ. of New York (United States)
Ronald Silverman, Columbia Univ. (United States)
Riverside Research Institute (United States)
Liping Liu, Hunter College of the City Univ. of New York (United States)
Parag V. Chitnis, Riverside Research Institute (United States)
Y. C. Chen, Hunter College of the City Univ. of New York (United States)

Published in SPIE Proceedings Vol. 7899:
Photons Plus Ultrasound: Imaging and Sensing 2011
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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