Combined photoreflectance/photoluminescence studies of the stability of semiconductor surface passivation

Combined photoreflectance/photoluminescence measurements are proposed for the study of the stability of semiconductor surface passivation. With such an approach, laser action on both charged and recombination-active electron states can be investigated. The efficiency of the method proposed is demonstrated with GaAs substrates passivated by selenium.     

Influence of the Particle Density Distribution on the Optical Resonance in a Fractal Cluster

Based on the equation of a self-consistent field in a fractal cluster, solutions are derived that characterize the laser field amplification as a function of the particle density distribution in the cluster. The influence of the specific features of the particle density distribution in the cluster on the resonance position is established.