Simultaneous Negative Phase and Group Velocity of Light in a Metamaterial

@article{Dolling2006SimultaneousNP,
  title={Simultaneous Negative Phase and Group Velocity of Light in a Metamaterial},
  author={G. Dolling and C. Enkrich and M. Wegener and C. Soukoulis and S. Linden},
  journal={Science},
  year={2006},
  volume={312},
  pages={892 - 894}
}
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… Expand
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