Simultaneous Negative Phase and Group Velocity of Light in a Metamaterial

  title={Simultaneous Negative Phase and Group Velocity of Light in a Metamaterial},
  author={Gunnar Dolling and Christian Enkrich and Martin Wegener and Costas M. Soukoulis and Stefan Linden},
  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… 
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