Focusing of light through scattering media

Fanting Kong; Ronald Silverman; Liping Liu; Parag V. Chitnis; Y. C. Chen

doi:10.1117/12.873836

18 February 2011 Focusing of light through scattering media

Fanting Kong, Ronald Silverman, Liping Liu, Parag V. Chitnis, Y. C. Chen

Proceedings Volume 7899, Photons Plus Ultrasound: Imaging and Sensing 2011; 789925 (2011) https://doi.org/10.1117/12.873836
Event: SPIE BiOS, 2011, San Francisco, California, United States

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.

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Fanting Kong, Ronald Silverman, Liping Liu, Parag V. Chitnis, and Y. C. Chen "Focusing of light through scattering media", Proc. SPIE 7899, Photons Plus Ultrasound: Imaging and Sensing 2011, 789925 (18 February 2011); https://doi.org/10.1117/12.873836

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KEYWORDS

Photoacoustic spectroscopy

Deformable mirrors

Light scattering

Speckle

Wavefronts

Particles

Transducers

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