Time-reversing a monochromatic subwavelength optical focus by optical phase conjugation of multiply-scattered light

@article{Park2017TimereversingAM,
  title={Time-reversing a monochromatic subwavelength optical focus by optical phase conjugation of multiply-scattered light},
  author={Jongchan Park and Chunghyun Park and KyeoReh Lee and Yong‐Hoon Cho and Yongkeun Park},
  journal={Scientific Reports},
  year={2017},
  volume={7}
}
Due to its time-reversal nature, optical phase conjugation generates a monochromatic light wave which retraces its propagation paths. Here, we demonstrate the regeneration of a subwavelength optical focus by phase conjugation. Monochromatic light from a subwavelength source is scattered by random nanoparticles, and the scattered light is phase conjugated at the far-field region by coupling its wavefront into a single-mode optical reflector using a spatial light modulator. Then the conjugated… 
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