Slow polaritons with orbital angular momentum in atomic gases

Abstract

Polariton formalism is applied for studying the propagation of a probe field of light in a cloud of cold atoms influenced by two control laser beams of larger intensity. The laser beams couple resonantly three hyperfine atomic ground states to a common excited state thus forming a tripod configuration of the atomic energy levels involved. The first control beam can have an optical vortex with the intensity of the beam going to zero at the vortex core. The second control beam without a vortex ensures the loseless (adiabatic) propagation of the probe beam at a vortex core of the first control laser. We investigate the storage of the probe pulse into atomic coherences by switching off the control beams, as well as its subsequent retrieval by switching the control beams on. The optical vortex is transferred from the control to the probe fields during the storage or retrieval of the probe field. We analyze conditions for the vortex to be transferred efficiently to the regenerated probe beam and discuss possibilities of experimental implementation of the proposed scheme using atoms like rubidium or sodium.

4 figures

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Cited by in corpus (13)

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• Transfer of optical vortices in coherently prepared media
• Complete energy conversion between light beams carrying orbital angular momentum using coherent population trapping for a coherently driven double-Λatom-light coupling
• Manipulation and exchange of Light with Orbital Angular Momentum in Quantum Dot Molecules
• Experimental demonstration of spinor slow light
• Electromagnetically induced transparency and nonlinear pulse propagation in a combined tripod and $\Lambda$ atom-light coupling scheme
• Identifying orbital angular momentum of light in quantum wells
• Photonic band-gap properties for two-component slow light
• Identifying the orbital angular momentum of light based on atomic ensembles
• Spatially strongly confined atomic excitation via two dimensional stimulated Raman adiabatic passage
• Microwave-induced orbital angular momentum transfer