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

被引：67
作者：
Stevens, TE
Wahlstrand, JK
Kuhl, J
Merlin, R [1 ]
机构：
[1] Univ Michigan, Harrison M Randall Lab Phys, Ann Arbor, MI 48109 USA
[2] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany
来源：
SCIENCE | 2001年 / 291卷 / 5504期
关键词：
D O I：
10.1126/science.291.5504.627
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
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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页码：627 / 630
页数：4
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