title: Light focusing in the Anderson regime.
abstract: Anderson localization is a regime in which diffusion is inhibited and waves (also electromagnetic waves) get localized. Here we exploit adaptive optics to achieve focusing in disordered optical fibres in the Anderson regime. By wavefront shaping and optimization, we observe the generation of a propagation-invariant beam, where light is trapped transversally by disorder, and show that Anderson localizations can be also excited by extended speckled beams. We demonstrate that disordered fibres allow a more efficient focusing action with respect to standard fibres in a way independent of their length, because of the propagation-invariant features and cooperative action of transverse localizations.
authors: 1] IPCF-CNR c/o Physics Department, University of Rome La Sapienza, P.le A. Moro 2, 00185 Roma, Italy [2] Center for Life Nano Science @Sapienza, Istituto Italiano di Tecnologia, Viale Regina Elena, 291, 00161 Roma, Italy.
authors: Marco
authors: M
authors: Leonetti
authors: Department of Electrical Engineering and Computer Science, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53201, USA.
authors: Salman
authors: S
authors: Karbasi
authors: Department of Electrical Engineering and Computer Science, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53201, USA.
authors: Arash
authors: A
authors: Mafi
authors: ISC-CNR and Department of Physics, University Sapienza, P.le Aldo Moro 5, I-00185 Roma, Italy.
authors: Claudio
authors: C
authors: Conti