Focusing beyond the diffraction limit with far-field time reversal.

@article{Lerosey2007FocusingBT,
  title={Focusing beyond the diffraction limit with far-field time reversal.},
  author={Geoffroy Lerosey and Julien de Rosny and Arnaud Tourin and Mathias Fink},
  journal={Science},
  year={2007},
  volume={315 5815},
  pages={1120-2}
}
We present an approach for subwavelength focusing of microwaves using both a time-reversal mirror placed in the far field and a random distribution of scatterers placed in the near field of the focusing point. The far-field time-reversal mirror is used to build the time-reversed wave field, which interacts with the random medium to regenerate not only the propagating waves but also the evanescent waves required to refocus below the diffraction limit. Focal spots as small as one-thirtieth of a… CONTINUE READING
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IEEE Trans. Ultrason. Ferroelectr. Freq. Control Phys. Rev. Lett

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