Wavefront shaping techniques in complex media

About wavefront shaping

Devices that allow to modulate the shape of the waves are all around us, in the form of digital displays or projectors. Such devices are known as Spatial Light Modulators (SLMs). The first SLMs developed in the eighties where cumbersome, expensive and possessed only few dozen of 'pixels' which limited their applications to few domains. They were in particular used in astronomy to compensate for the optical aberration of the atmosphere. The emergence of new technologies of Spatial Light Modulators (liquid crystals, micro-mirors) allows to control light with a huge number of pixels on a small scale while being relatively cheap. This opened the way to the use of SLMs in complex media taking advantage of the number of degrees of freedom offered by these new devices. In 2007 I.M. Vellekoop and A.P. Mosk performed a pioneer experiment in which they reported focusing of coherent light through opaque scattering materials by control of the incident wavefront. Since then, many groups in the world started working on the applications of active wavefront shaping in complex media for various purposes; imaging, focusing, micro-manipulation, study of coherent transport of light through scattering media...

To read : A pioneer experiment / Active groups in the world / Publications


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