Butsuri
Online ISSN : 2423-8872
Print ISSN : 0029-0181
ISSN-L : 0029-0181
Fast Light, Slow Light and Group Velocity
Makoto Tomita
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JOURNALS OPEN ACCESS

2013 Volume 68 Issue 8 Pages 516-523

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Abstract

Traditional group velocity is defined by the first-order derivative of the real part of the refractive index. This definition breaks down when the wave packet propagates over long distances. In this article, we discuss group velocity in the context of various velocities in the medium, introducing a new definition for group velocity applicable even in strongly dispersive media.

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© 2013 The Physical Society of Japan
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