Simultaneous negative phase and group velocity of light in a metamaterial
Simultaneous negative phase and group velocity of light in a metamaterial
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DOI：
10.1126/science.1126021
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发表时间：
2006-05-12
期刊：
影响因子：
56.9
通讯作者：
Linden, S
中科院分区：
文献类型：
--
作者：
Dolling, G;Enkrich, C;Linden, S
我们研究了飞秒激光脉冲通过超材料的传播，该超材料对 1.5 微米左右的波长具有负折射率。从有样品和没有样品的迈克尔逊干涉仪的干涉条纹，我们直接推断出相位时间延迟。根据脉冲包络偏移，我们确定了群时间延迟。在光谱区域，相位和群速度同时为负。这意味着输出脉冲的载波和脉冲包络峰值在其输入脉冲对应物进入样品的前侧之前出现在样品的后侧。
We investigated the propagation of femtosecond laser pulses through a metamaterial that has a negative index of refraction for wavelengths around 1.5 micrometers. From the interference fringes of a Michelson interferometer with and without the sample, we directly inferred the phase time delay. From the pulse-envelope shift, we determined the group time delay. In a spectral region, phase and group velocity are negative simultaneously. This means that both the carrier wave and the pulse envelope peak of the output pulse appear at the rear side of the sample before their input pulse counterparts have entered the front side of the sample.