Journal
APPLIED PHYSICS LETTERS
Volume 81, Issue 15, Pages 2713-2715Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1512828
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We show that a modulated Gaussian beam undergoes negative refraction at the interface between a positive and negative refractive index material. While the refraction of the beam is clearly negative, the modulation interference fronts are not normal to the group velocity, and thus exhibit a sideways motion relative to the beam-an effect due to the inherent frequency dispersion associated with the negative index medium. In particular, the interference fronts appear to bend in a manner suggesting positive refraction, such that for a plane wave, the true direction of the energy flow associated with the refracted beam is not obvious. (C) 2002 American Institute of Physics.
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