| What causes the superluminal propagation of light pulses |
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| 作者姓名： | 朱诗尧 王立刚 |
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| 作者单位： | Department of Physics，Hong Kong Baptist University，Hong Kong，Department of Physics，Hong Kong Baptist University，Hong Kong |
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| 摘 要： | In this paper, we discuss what causes the superluminal propagation of a pulse through dispersion bysolving Maxwell's equations without any approximation. The coherence of the pulse plays an importantrole for superluminal propagation. When the pulse becomes partially coherent,the propagation changesfrom superluminal to subluminal. The energy velocity is always less than the vacuum velocity.The shapeof the pulse is changed during the propagation.
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What causes the superluminal propagation of light pulses |
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| Abstract: | In this paper, we discuss what causes the superluminal propagation of a pulse through dispersion by solving Maxwell's equations without any approximation. The coherence of the pulse plays an important role for superluminal propagation. When the pulse becomes partially coherent, the propagation changes from superluminal to subluminal. The energy velocity is always less than the vacuum velocity. The shape of the pulse is changed during the propagation. |
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