Interaction of Electromagnetic Radiation with Atomic Systems

Carson L. Tang

J. Michael Hollas

Vyacheslav I. Yukalov

Interplay between the effects of coherent radiation and localization of light is analysed. A system of two–level atoms is placed in a medium interacting with electromagnetic field. The matter–light interaction can result in the appearance of a band gap in the spectrum of polariton states. If an atom with a resonance frequency inside the gap is incorporated into such a medium, the atomic spontaneous emission is suppressed, which is termed the localization of light. However, a system of resonance atoms inside the gap can radiate due to their coherent interactions. The peculiarity of the coherent radiation by a system of atoms, under the localization of light for a single atom, is studied. 1 1 Localization of Light In some cases a medium may possess an electromagnetic band gap where a severe depressions of the photon density of states occurs. One such case

Constantinos Simserides

The subject of this book is based on the compulsory course "Quantum Optics and Lasers" of the Department of "Solid State Physics" of the Faculty of Physics of the Natural Sciences School of the National and Kapodistrian University of Athens. 1. Introduction to the quantum nature of light. 2. Mechanisms of interaction of electromagnetic (EM) radiation and matter (two-level system). 3. Semiclassical approach of the interaction of EM radiation and matter. EM field: classically. Two-level system e.g. atom: quantum mechanically. 4. Quantum mechanical approach of the interaction of EM radiation and matter. EM field quantization. 5. Lasers. 6. Density matrix. 7. Some other issues for the properties and the operation of Lasers.

Brijesh Kumar

A two-level atom interacting with a single mode of quantized electromagnetic radiation is discussed using a new representation in which the atom and the radiation are unified into a single canonical Bose field. At the twice resonance , when the frequency of the original radiation is twice the atomic transition frequency (ω = 2 ), the emergent unified field in the non-interacting atom–field system resembles a free radiation of frequency . This free emergent radiation is further shown to exist in the presence of an interaction which looks similar to the atom–field interaction in the dipole approximation. The one-photon correlation and the population inversion are discussed as the possible means of observing the emergent radiation. The entanglement properties of the emergent radiation are also discussed.

Igor I Sobel'man