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Localization of Light: Anderson and beyond

Grant number: 23/03300-7
Support Opportunities:Regular Research Grants
Duration: February 01, 2024 - January 31, 2028
Field of knowledge:Physical Sciences and Mathematics - Physics - Atomic and Molecular Physics
Convênio/Acordo: ANR
Principal Investigator:Romain Pierre Marcel Bachelard
Grantee:Romain Pierre Marcel Bachelard
Principal researcher abroad: Robin Kaiser
Institution abroad: Institut de Physique de Nice, Site Sophia-Antipolis, France
Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
Associated researchers:André Cidrim Santos

Abstract

Localization of light in three-dimensional disordered samples has been elusive up to date, with several initial experimental reports, followed a few years later by their re-interpretation. While absorption and nonlinear effects may be to blame for erroneous interpretations of these early experiments, later theoretical insights predict that near field dipole-dipole coupling terms in 3D actually can prevent localization. However novel elegant solutions have emerged recently, but still need to be implemented in experiments.This project addresses Anderson localization of light in cold atom systems, gathering the experimental and theoretical efforts from, respectively, the French and Brazilian partners. The first objective is to determine how to induce localization of light in atomic samples by introducing, for example, diagonal disorder or positional correlations. The second objective is to determine unambiguous signatures for localization, investigating in particular the profile of the transmitted light and the propagation of the excitations in the system. The last objective is to identify how the presence of several photons/excitations in the cloud, instead of a single one for the Anderson regime, will affect localization: This represents a first step toward the many-body regime. (AU)

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