title: Coherent backscattering enhancement in cavities. Highlights of the role of symmetry.
abstract: Through experiments and simulations, the consequences of symmetry on coherent backscattering enhancement (CBE) are studied in cavities. Three main results are highlighted. First, the CBE outside the source is observed: (a) on a single symmetric point in a one-dimensional (1-D) cavity, in a disk and in a symmetric chaotic plate; (b) on three symmetric points in a two-dimensional (2-D) rectangle; and (c) on seven symmetric points in a three-dimensional (3-D) parallelepiped cavity. Second, the existence of enhanced intensity lines and planes in 2-D and 3-D simple-shape cavities is demonstrated. Third, it is shown how the anti-symmetry caused by the special boundary conditions is responsible for the existence of a coherent backscattering decrement with a dimensional dependence of R = (½)(d), with d = 1,2,3 as the dimensionality of the cavity.
authors.affiliation: Laboratoire de Géophysique Interne et Tectonophysique, Centre National de la Recherche Scientifique & Université J Fourier, Grenoble 38041, France. thomas.gallot@obs.ujf-grenoble.fr
authors.forename: Thomas
authors.initials: T
authors.lastname: Gallot
authors.forename: Stefan
authors.initials: S
authors.lastname: Catheline
authors.forename: Philippe
authors.initials: P
authors.lastname: Roux
mesh_terms: D000162:Acoustics; D003198:Computer Simulation; D006908:Hydroxyprogesterones; D008962:Models, Theoretical; D055095:Optics and Photonics
chemical_list: D006908:Hydroxyprogesterones; C030228:11-hydroxyprogesterone