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Spatiotemporal Wave Front Shaping in a Microwave Cavity.
Philipp Del Hougne1, Fabrice Lemoult1, Mathias Fink1
1Institut Langevin, CNRS UMR 7587, ESPCI Paris, PSL Research University, 1 rue Jussieu, 75005 Paris, France.
Physical Review Letters
|October 8, 2016
Summary
Researchers demonstrate spatiotemporal focusing of microwaves in complex media using electronically tunable resonators. Wavefront shaping effectively utilizes all available spatial and temporal degrees of freedom for enhanced control.
Area of Science:
- Wave physics
- Electromagnetics
- Metamaterials
Background:
- Controlling wave propagation in complex media is crucial.
- Wavefront shaping and time reversal are key techniques.
- Optical pulse focusing through scattering media has been demonstrated.
Purpose of the Study:
- To transpose optical wavefront shaping to microwave cavities.
- To investigate spatiotemporal focusing using electronically tunable resonators.
- To analyze the role of spatial and temporal degrees of freedom (DOF) in wave control.
Main Methods:
- Utilizing flat arrays of electronically tunable resonators in a microwave cavity.
- Maximizing the Green's function between antennas for focusing.
- Modifying photon dwell time to alter spatial and temporal DOF distribution.
Main Results:
- Achieved diffraction-limited spatiotemporal focusing of microwaves.
- Demonstrated that wavefront shaping utilizes all available DOF, regardless of their nature.
- Showed that changing dwell time does not impact field enhancement.
Conclusions:
- Electronically reconfigurable arrays enable viable spatiotemporal control of microwaves.
- Wavefront shaping effectively couples spatial and temporal DOF in complex media.
- Potential applications exist in imaging, therapy, telecommunications, radar, and sensing.
