期刊
SCIENCE
卷 291, 期 5504, 页码 627-630出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.291.5504.627
关键词
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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 medium. The dipolar Cherenkov field, in the range of infrared-active phonons, is identical to that of phonon polaritons produced by impulsive Laser excitation.
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