Controlling light propagation in comple...Sylvain Gigan
Light Control in complex media : from im...Sylvain Gigan
Conférence de Sylvain Gigan lors du séminaire général du département de physique.
Première partie: Light Control in complex media : from imaging to mesoscopic physics... and back (1/2)
Scattering of light in heterogeneous media, for instance the skin or a glass of milk, is usually considered an inevitable perturbation or even a nuisance. Through repeated scattering and interferences, this phenomenon seemingly destroys both the spatial and the phase information of any laser illumination and gives rise to the well-known “speckle” interference patterns. At the temporal (or spectral) level, a short pulse entering a scattering medium will see its length greatly extended due to the multiplicity of possible path length light can take before exiting the medium.
Multiple scattering is a highly complex but nonetheless deterministic process : it is therefore reversible, in the absence of absorption : speckle is coherent, and can be coherently controlled. By « shaping » or « adapting » the incident light, it is in principle possible to control the propagation and overcome the scattering process. The central tool that we exploit is the ability to measure the transmission matrix of a complex medium.
In the first lecture, I will first details the basics of light scattering and disordered media, and then show how the concept of wavefront shaping has opened tremendous prospects for optical imaging through and in complex media.
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Sylvain Gigan
Institutions : Ecole normale supérieure-PSL
Cursus :
Sylvain Gigan est Professeur à l’université Pierre et Marie Curie et chercheur au Laboratoire Kastler Brossel à l'ENS, dans l’équipe Imagerie optique et application aux milieux biologiques et diffusants.
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