Coherent phonon-polaritons and subluminal Cherenkov radiation

被引:6
作者
Wahlstrand, JK
Stevens, TE
Kuhl, J
Merlin, R
机构
[1] Univ Michigan, Dept Phys, Harrison M Randall Lab Phys, Ann Arbor, MI 48109 USA
[2] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany
关键词
coherent phonon-polaritons; Cherenkov radiation; ZnTe; ZnSe;
D O I
10.1016/S0921-4526(02)00425-8
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
We use an optical method based on sub-picosecond pulses moving in a nonlinear medium to generate relativistic dipoles that emit Cherenkov phonon-polariton radiation. Experiments on ZnTe and ZnSe reveal emission at subluminal speeds involving frequencies below those of the corresponding infrared-active phonon. The generation of Cherenkov radiation and impulsive stimulated Raman scattering by polaritons are the same physical phenomenon. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:55 / 61
页数:7
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