Title:
Simultaneous Negative Phase and Group Velocity of Light in a Metamaterial
Author(s):
Gunnar Dolling, Christian Enkrich, Martin Wegener, Costas M. Soukoulis, Stefan Linden
Source:
Science
Vol./Issue/Date:
Vol 31, 892 (2006)
Year:
2006
Page(s):
892-894
Keywords:
Abstract:
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.
Document:
Reference Id:
299
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