title: Exploiting the time-reversal operator for adaptive optics, selective focusing, and scattering pattern analysis.
abstract: We report on the experimental measurement of the backscattering matrix of a weakly scattering medium in optics, composed of a few dispersed gold nanobeads. The decomposition of the time-reversal operator is applied to this matrix and we demonstrate selective and efficient focusing on individual scatterers, even through an aberrating layer. Moreover, we show that this approach provides the decomposition of the scattering pattern of a single nanoparticle. These results open important perspectives for optical imaging, characterization, and selective excitation of nanoparticles.
authors.affiliation: Institut Langevin, ESPCI ParisTech, CNRS UMR 7587, Universités Paris VI & VII, INSERM, 10 rue Vauquelin, 75231 Paris Cedex 05, France.
authors.forename: S M
authors.initials: SM
authors.lastname: Popoff
authors.forename: A
authors.initials: A
authors.lastname: Aubry
authors.forename: G
authors.initials: G
authors.lastname: Lerosey
authors.forename: M
authors.initials: M
authors.lastname: Fink
authors.forename: A C
authors.initials: AC
authors.lastname: Boccara
authors.forename: S
authors.initials: S
authors.lastname: Gigan
mesh_terms: D006046:Gold / Q000737:chemistry*; D007834:Lasers; D053768:Metal Nanoparticles / Q000737:chemistry*; D008863:Microspheres; D055620:Optical Phenomena; D013997:Time Factors
chemical_list: D006046:Gold