The time-domain theory of forerunners (precursors) in temporally dispersive, nonmagnetic, isotropic materials is developed with the propagator technique. Specifically, the impulse response at a (comparatively) large propagation depth is expanded in two different ways: (a) with respect to the wave front and (b) with respect to slowly varying field components. A few numerical examples illustrating the theory are given.
© 1998 Optical Society of America
(010.7350) Atmospheric and oceanic optics : Wave-front sensing
(160.2100) Materials : Electro-optical materials
(260.2110) Physical optics : Electromagnetic optics
(350.5500) Other areas of optics : Propagation
Anders Karlsson and Sten Rikte, "Time-domain theory of forerunners," J. Opt. Soc. Am. A 15, 487-502 (1998)