2004•Journal of Beijing Broadcasting InstituteRequires access

Superluminal and Negative Group Velocity in Electro-magnetic Wave Propagation

Jian Guan

Abstract

In this paper, a penetrating analysis is first made of the superluminal and negative group velocities that occur in the EM wave propagation. Discussed then are the superluminal and negative group velocities which are in the state of evanescent waves in the waveguide below-cutoff (WBCO). Through an experiment in the coaxial photonic crystal a group velocity of 1.5 - 2.4 times the speed of light are observed in the stop band.

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Key concepts: Superluminal motion, Group velocity, Physics, Group (periodic table), Cutoff, Optics, Coaxial, Slow light