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SUMMARY:EE-SRI: Time-Reversed Waves\, Complexity and Information
DTSTART:20120618T161500
DTEND:20120618T171500
DTSTAMP:20260407T051329Z
UID:1391fd8c66dc24b53a26c7f4a3f3fd265c4e0abea1d0c0aac9308ec2
CATEGORIES:Conferences - Seminars
DESCRIPTION:Mathias Fink\, Institut Langevin\, Ecole Supérieure de Physiq
 ue et de Chimie Industrielles de la Ville de Paris\nAbstract\nTime-reversa
 l invariance is a very fundamental concept in classical and quantum physic
 s. The main objective of this talk is to show how this concept can be used
  to control waves both in space and time in complex media. It was first in
  the field of acoustics and later for microwaves\, where broadband antenna
  array technology was available\, that “time-reversal mirrors” have be
 en built. Taking advantage of the full control of the spatio-temporal degr
 ees of freedom of waves\, such mirrors allow to refocuses in space and tim
 e an incident wave at the original source location regardless of the compl
 exity of the propagation medium. Contrary to intuition\, a remarkable prop
 erty was shown: the more complex the propagation medium\, the sharper the 
 focus. Such results have been recently extended to focus on spots much sma
 ller than the wavelength using new sub-wavelength structured media\, openi
 ng new avenues toward super-resolution imaging and high rate telecommunica
 tions.\nTime reversal mirrors are not only unique research tools in the fi
 eld of fundamentals physics but they have plenty applications including th
 erapy\, medical imaging\, telecommunications\, underwater acoustics\, seis
 mology\, human-machine interface.\nRecently\, new tools available in optic
 s such as sensitive and fast megapixel digital sensors and modulators\, ar
 e opening new perspectives toward time reversal of light.
LOCATION:Room MXF1
STATUS:CONFIRMED
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