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Controlling the light distribution through turbid media with wavefront shaping based on volumetric optoacoustic feedback.

Proc. SPIE 9717:97171L (2016)
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Wavefront shaping based on optoacoustic (photoacoustic) feedback has recently emerged as a promising tool to control the light distribution in optically-scattering media. In this approach, the phase of a short-pulsed light beam is spatially-modulated to create constructive light interference (focusing) at specific locations in the speckle pattern of the scattered wavefield. The optoacoustic signals generated by light absorption provide a convenient feedback mechanism to optimize the phase mask of the spatial light modulator in order to achieve the desired light intensity distribution. The optimization procedure can be done by directly considering the acquired signals or the reconstructed images of the light absorption distribution. Recently, our group has introduced a volumetric (three-dimensional) optoacoustic wavefront shaping platform that enables monitoring the distribution of light absorption in an entire volume with frame rates of tens of Hz. With this approach, it is possible to simultaneously control the volumetric light distribution through turbid media. Experiments performed with absorbing microparticles distributed in a three-dimensional region showcase the feasibility of enhancing the light intensity at specific points, where the size of particles is also essential to maximize the signal enhancement. The advantages provided by optoacoustic imaging in terms of spatial and temporal resolution anticipate new capabilities of wavefront shaping techniques in biomedical optics.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Optoacoustic imaging, photoacoustic imaging, wavefront shaping, light focusing, turbid media
ISSN (print) / ISBN 0277-786X
e-ISSN 1996-756X
Book Volume Title Adaptive Optics and Wavefront Control for Biological Systems II
Conference Date February 13, 2016
Conference Location San Francisco, California, United States
Quellenangaben Volume: 9717, Issue: , Pages: , Article Number: 97171L Supplement: ,
Publisher SPIE
Reviewing status Peer reviewed