25/05/2017 - Long-range in light scattering by cold atoms - Palestrante: Romain Bachelard (DF-UFSCar)
Seminário de Probabilidade e Sistemas Complexos
Palestrante: Romain Bachelard (DF-UFSCar)
Local: Auditório Fávaro do ICMC.
Data e horário: Quinta feira, dia 25 de maio de 2017 às 14h.
Título: Long-range in light scattering by cold atoms
Abstract: The scattering of light by cold atomic clouds, and many over light scattering problems, is a long-range problem by nature. Indeed, the light creates an effective interaction between the particles, which presents the slow decay of waves over large distances. This allows to reach a strong 'long-range' coupling between the particles, a paradigmatic example being the mean-field coupling of atoms in 1D optical cavities. 3D systems also exhibit strong inter-particle coupling, with a 1/r decay over long distances. As a result from this all-to-all strong coupling, a variety of 'cooperative' effects were observed in light scattering by atomic clouds, that are the signatures of the presence of macroscopic modes. In this presentation, we will discuss such cooperative phenomena in large atomic clouds, and the techniques and models to deal with them. These phenomena include superradiance and subradiance, Mie scattering and cooperative radiation spectrum.