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A: Fachverband Atomphysik
A 28: Poster Session - Atomic Physics IV
A 28.23: Poster
Donnerstag, 12. März 2020, 16:00–18:00, Empore Lichthof
A cooperative optical mirror formed by a subradiant sub-wavelength atomic array — •David Wei1, Jun Rui1, Antonio Rubio-Abadal1, Simon Hollerith1, Kritsana Srakaew1, Simon Evered1, Immanuel Bloch1,2,3, and Christian Gross1 — 1Max-Planck-Institut für Quantenoptik, Garching, Germany — 2Fakultät für Physik, Ludwig-Maximilians-Universität, München, Germany — 3Munich Center for Quantum Science and Technology (MCQST), München, Germany
Ensembles of closely spaced quantum emitters can respond cooperatively due to photon-mediated dipole-dipole interactions. Using atomic dipoles trapped in an optical lattice, we realize a two-dimensional sub-wavelength square array, which shows strong subradiant response and acts as a single-layered cooperative optical mirror.
By varying the density and the ordering of the atoms in the array, we are able to control the influence of the dipolar interactions and to study the role of spatial order for the collective properties. Using Bloch oscillations to change the atom positions, we dynamically modify the reflectivity of the atomic mirror due to breaking and restoring the array order. Our work demonstrates efficient optical meta-material engineering which might give rise to novel atomic light-matter interfaces.