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SUMMARY:Measuring the transmission matrix of a complex medium : focusing a
 nd beyond
DTSTART:20120905T140000
DTSTAMP:20260928T210159Z
UID:5471e698ed2dc15927ce4dd47447ad15c4d4c4f59574eb44bdf2a561
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Sylvain Gigan\, ESPCI ParisTech\nScattering of coherent 
 light in disordered media\, such as heterogeneous biological tissues\, lea
 ds to strong scattering and interferences phenomena which seemingly destro
 y both the spatial amplitude and phase information of any laser illuminati
 on. At the spatial level\, it gives rise to the well-known “speckle”. 
 At the temporal (or spectral) level\, a short pulse entering a scattering 
 medium will be stretched due to the multiplicity of path lengths in the pr
 opagating medium. Scattering greatly limits the possibility to image or ma
 nipulate with light in a complex medium. Fortunately\, multiple scattering
  is a highly complex but nonetheless deterministic process: it is therefor
 e reversible\, in the absence of absorption\, and speckle can be coherentl
 y controlled. By « shaping » or « adapting » the incident wavefront\, 
 it is in principle possible to control the propagation and to overcome the
  scattering process. Liquid crystal spatial light modulator (SLM) is a too
 l of choice to shape at will a laser beam over a very large number of mode
 s\, in order to match the high complexity of a multiple scattering. I will
  show how\, using an SLM\, one can measure the transmission matrix which l
 inks the input - output modes of a scattering medium.  I will detail our 
 recent experiments with phase-SLMs applied to\, spatial focusing\, imaging
  and phase conjugation through a thick opaque multiply scattering media. B
 eyond the spatial aspects of wave control\, I will also review the recent 
 progress on temporal control in complex media.
LOCATION:BM 1130 https://plan.epfl.ch/?room==BM%201130
STATUS:CONFIRMED
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