Exchange of optical vortices using an electromagnetically induced transparency based four-wave mixing setup

Abstract

We propose a scheme to exchange optical vortices of slow light using the phenomenon of electromagnetically induced transparency (EIT) in a four-level double-$\Lambda$ atom-light coupling scheme illuminated by a pair of probe fields as well as two control fields of larger intensity. We study the light-matter interaction under the situation where one control field carries an optical vortex, and another control field has no vortex. We show that the orbital angular momentum (OAM) of the vortex control beam can be transferred to a generated probe field through a four-wave mixing (FWM) process and without switching on and off of the control fields. Such a mechanism of OAM transfer is much simpler than in a double-tripod scheme in which the exchange of vortices is possible only when two control fields carry optical vortices of opposite helicity. The losses appearing during such OAM exchange are then calculated. It is found that the one-photon detuning plays an important role in minimizing the losses. An approximate analytical expression is obtained for the optimal one-photon detuning for which the losses are minimum while the intensity of generated probe field is maximum. The influence of phase mismatch on the exchange of optical vortices is also investigated. We show that in presence of phase mismatch the exchange of optical vortices can still be efficient.

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Cited by in corpus (10)

• 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
• Off-axis optical vortices using double-Raman singlet and doublet light-matter schemes
• Four-wave mixing based orbital angular momentum translation
• Transfer and evolution of structured polarization in a double-V atomic system
• Ultimate conversion efficiency bound for the forward double-$\Lambda$ atom-light coupling scheme
• Spatial distribution of two symmetric four-wave mixing signals induced by Gaussian beams
• Inhomogeneous mass trap for dark-state polaritons in atomic media
• Coherent phase control of orbital-angular-momentum light-induced torque in a double-tripod atom-light coupling scheme