而波向量 k 是指相速度 (phase velocity)的前进方向，故左手系(left-handed) 介质又可称之为负群速(negative group velocity)介 质，通常是发生在非同向性(anisotropic)材料或具 有空间色散性质(spatial dispersion)的介质。
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Thus the negative group velocity is simply an apparent velocity as we shall show from the study of energy flow.
因此，负群速度只是表观速度，能流的研究结果也证明了这一点。
The result shows that the edged sampling mirror and the edged vacuum window can be treated as a pair of prisms, which generates negative group velocity dispersion.
分析结果表明，带楔角的取样反射镜与后续光路中使用楔形真空窗口构成了一对棱镜，产生负的群速度色散。
Experimentally, a light pulse propagating through the atomic vapor cell has its peak reaching the exit side before entering it, resulting in a negative transit time, and negative group velocity.
研究发现，当光脉冲通过一个原子气室时，在进入前其峰即到达出口处，造成负渡越时间和负群速。
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