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Proceedings Paper

Controlling the light distribution through turbid media with wavefront shaping based on volumetric optoacoustic feedback
Author(s): X. Luís Deán-Ben; Héctor Estrada; Ali Özbek; Daniel Razansky
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Paper Abstract

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.

Paper Details

Date Published: 15 March 2016
PDF: 5 pages
Proc. SPIE 9717, Adaptive Optics and Wavefront Control for Biological Systems II, 97171L (15 March 2016); doi: 10.1117/12.2213490
Show Author Affiliations
X. Luís Deán-Ben, Institute for Biological and Medical Imaging, Technical Univ. of Munich and Helmholtz Ctr. Munich (Germany)
Héctor Estrada, Institute for Biological and Medical Imaging, Technical Univ. of Munich and Helmholtz Ctr. Munich (Germany)
Ali Özbek, Institute for Biological and Medical Imaging, Technical Univ. of Munich and Helmholtz Ctr. Munich (Germany)
Daniel Razansky, Institute for Biological and Medical Imaging, Technical Univ. of Munich and Helmholtz Ctr. Munich (Germany)


Published in SPIE Proceedings Vol. 9717:
Adaptive Optics and Wavefront Control for Biological Systems II
Thomas G. Bifano; Joel Kubby; Sylvain Gigan, Editor(s)

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