INFLUENCE OF SURFACE CORRUGATIONS ON SURFACE ELECTROMAGNETIC WAVES

Ce papier présente la preuve expérimentale de l'influence de l'uniformité des profils d'un réseau sur le couplage des ondes électromagnétiques de surface et les courbes de dispersion de ces ondes lorsqu'elles se propagent sur des surfaces à échelons périodiques.We present experimental evidence of the influence of grating profile uniformity on surface electromagnetic wave (SEW) coupling and dispersion curves for SEWs propagating on periodically corrugated surfaces

Magneto-optical properties of biaxially strained quantum wells

We have studied the optical properties of GaAs1 - xPx/Ga0.65 Al0.35 As quantum wells as a function of well width and phosphorus concentration in the presence of an external magnetic field. The combination of confinement and lattice-mismatch effects in this system allows tuning of the splitting between the heavy-hole and light-hole subbands. The ground- and excited-state energies of the excitons are obtained from low-temperature photoluminescence excitation spectroscopy. From an analysis of the fan diagrams, using a two-dimensional hydrogenic model, we have determined the binding energies and the reduced effective masses of the heavy-hole and light-hole excitons. An enhancement of the effective masses of the holes is observed as the heavy- and light-hole subbands approach. An unexpected behaviour of the degree of polarization of the excitons with increasing magnetic field is also observed.Peer reviewed: YesNRC publication: N