Physics – General Physics
Scientific paper
2001-04-02
Phys. Rev. A65 (2002) 015802
Physics
General Physics
6 pages
Scientific paper
10.1103/PhysRevA.65.015802
The Poynting vector, energy density and energy velocity of light pulses propagating in anomalous dispersion medium (used in WKD-like experiments) are calculated. Results show that a negative energy density in the medium propagates along opposite of incident direction with such a velocity similar to the negative group velocity while the direction of the Poynting vector is positive. In other words, one might say that a positive energy density in the medium would propagate along the positive direction with a speed having approximately the absolute valueof the group velocity. We further point out that neither energy velocity nor group velocity is a good concept to describe the propagation process of light pulse inside the medium in WKD experiment owing to the strong accumulation and dissipation effects.
Huang Chao-Guang
Zhang Yuan-Zhong
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