Abstract

Causality in two different dielectric models is analyzed by studying the reflection of a deltiform pulse in a vacuum–dielectric interface. It is shown that, while for a Lorentz dielectric the reflected pulse has a causal behavior, for a modified Lorentz dielectric—built up by replacing the damping force of the Lorentz model by the radiation reaction force—the reflected pulse appears before the incident pulse touches the interface.

© 1986 Optical Society of America

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