EE-SRI: Time-Reversed Waves, Complexity and Information
Event details
| Date | 18.06.2012 |
| Hour | 16:15 › 17:15 |
| Speaker | Mathias Fink, Institut Langevin, Ecole Supérieure de Physique et de Chimie Industrielles de la Ville de Paris |
| Location |
Room MXF1
|
| Category | Conferences - Seminars |
Abstract
Time-reversal invariance is a very fundamental concept in classical and quantum physics. 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 been built. Taking advantage of the full control of the spatio-temporal degrees of freedom of waves, such mirrors allow to refocuses in space and time an incident wave at the original source location regardless of the complexity of the propagation medium. Contrary to intuition, a remarkable property was shown: the more complex the propagation medium, the sharper the focus. Such results have been recently extended to focus on spots much smaller than the wavelength using new sub-wavelength structured media, opening new avenues toward super-resolution imaging and high rate telecommunications.
Time reversal mirrors are not only unique research tools in the field of fundamentals physics but they have plenty applications including therapy, medical imaging, telecommunications, underwater acoustics, seismology, human-machine interface.
Recently, new tools available in optics such as sensitive and fast megapixel digital sensors and modulators, are opening new perspectives toward time reversal of light.
Time-reversal invariance is a very fundamental concept in classical and quantum physics. 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 been built. Taking advantage of the full control of the spatio-temporal degrees of freedom of waves, such mirrors allow to refocuses in space and time an incident wave at the original source location regardless of the complexity of the propagation medium. Contrary to intuition, a remarkable property was shown: the more complex the propagation medium, the sharper the focus. Such results have been recently extended to focus on spots much smaller than the wavelength using new sub-wavelength structured media, opening new avenues toward super-resolution imaging and high rate telecommunications.
Time reversal mirrors are not only unique research tools in the field of fundamentals physics but they have plenty applications including therapy, medical imaging, telecommunications, underwater acoustics, seismology, human-machine interface.
Recently, new tools available in optics such as sensitive and fast megapixel digital sensors and modulators, are opening new perspectives toward time reversal of light.
Practical information
- Informed public
- Free
- This event is internal
Organizer
- EE Institute
Contact
- Philippe Gay-Balmaz, Suzanne Buffat