Direct measurement of the wigner delay associated with the goos-Hanchen effect
It is shown experimentally that the nonspecular reflection of light on an interface induces a time delay, as predicted by Wigner's scattering theory. A differential femtosecond technique is used to directly isolate this delay, associated with the Goos-Hanchen spatial shift produced by a grating near a resonant Wood anomaly. A delay of 4.4 fs is observed between TE and TM pulses, in agreement with the expected Wigner delay obtained from phase shift dispersion measurements.
Chauvat
D
Laboratoire d'Electronique Quantique-Physique des Lasers, Unite Mixte de Recherche du Centre National de la Recherche Scientifique 6627, Universite de Rennes 1, Campus de Beaulieu, F-35042 Rennes Cedex, France.
Emile
O
Bretenaker
F
Le Floch A