title: Enhanced Optical Cross Section via Collective Coupling of Atomic Dipoles in a 2D Array.
abstract: Enhancing the optical cross section is an enticing goal in light-matter interactions, due to its fundamental role in quantum and nonlinear optics. Here, we show how dipolar interactions can suppress off-axis scattering in a two-dimensional atomic array, leading to a subradiant collective mode where the optical cross section is enhanced by almost an order of magnitude. As a consequence, it is possible to attain an optical depth which implies high-fidelity extinction, from a monolayer. Using realistic experimental parameters, we also model how lattice vacancies and the atomic trapping depth affect the transmission, concluding that such high extinction should be possible, using current experimental techniques.
authors.affiliation: Department of Physics, Joint Quantum Center (JQC) Durham-Newcastle, Durham University, South Road, Durham DH1 3LE, United Kingdom.
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Bettles
authors.affiliation: Department of Physics, Joint Quantum Center (JQC) Durham-Newcastle, Durham University, South Road, Durham DH1 3LE, United Kingdom.
authors.forename: Simon A
authors.initials: SA
authors.lastname: Gardiner
authors.affiliation: Department of Physics, Joint Quantum Center (JQC) Durham-Newcastle, Durham University, South Road, Durham DH1 3LE, United Kingdom.
authors.forename: Charles S
authors.initials: CS
authors.lastname: Adams