arXiv subjects

Ramy G. S. El-Dardiry

Publications and source records attributed to Ramy G. S. El-Dardiry.

2 recordsLinked to original sources

arXiv2012

Probing the dynamics of Anderson localization through spatial mapping

We study (1+1)D transverse localization of electromagnetic radiation at microwave frequencies directly by two-dimensional spatial scans. Since the longitudinal direction can be mapped onto time, our experiments provide unique snapshots of the build-up of localized waves. The evolution of the wave functions is compared with numerical calculations. Dissipation is shown to have no effect on the occurrence of transverse localization. Oscillations of the wave functions are observed in space and explained in terms of a beating between the eigenstates.

cond-mat.dis-nn↗

arXiv2010

Classification of light sources and their interaction with active and passive environments

The emission properties of a molecular light source depend on its optical and chemical environment. This dependence, however, is different for various light sources. We present a general classification of sources by introducing the concepts of Constant Amplitude and Constant Power Sources. The unforeseen consequences of this classification are illustrated for photonic studies by random laser experiments. Comparison of the experimental results with properly customized rate equations identifies the type of light source in the gain medium and an estimate for its quantum efficiency. Our results require a major revision of source studies in multiple scattering media.

physics.optics↗