Cherenkov radiation at speeds below the light threshold: phonon-assisted phase matching.

@article{Stevens2001CherenkovRA,
  title={Cherenkov radiation at speeds below the light threshold: phonon-assisted phase matching.},
  author={Thomas E. Stevens and Jared K. Wahlstrand and Jurgen F. W. Kuhl and Roberto Merlin},
  journal={Science},
  year={2001},
  volume={291 5504},
  pages={
          627-30
        }
}
Charged particles traveling through matter at speeds larger than the phase velocity of light in the medium emit Cherenkov radiation. Calculations reveal that a given angle of the radiation conical wavefront is associated with two velocities, one above and one below a certain speed threshold. Emission at subluminal but not superluminal speeds is predicted and verified experimentally for relativistic dipoles generated with an optical method based on subpicosecond pulses moving in a nonlinear… CONTINUE READING

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