Manipulation and exchange of Light with Orbital Angular Momentum in Quantum Dot Molecules

Abstract

We study the interaction of laser pulses carrying orbital angular momentum (OAM) with structural asymmetry quantum dot molecules characterized by four energy levels. We demonstrate how the inter-dot tunneling endows exchange of optical vortices between different frequencies. We consider a case where a weak probe beam has an optical vortex and thus has a zero intensity at the center. The presence of tunneling coupling generates an additional weak laser beam with the same vorticity as that of the incident vortex beam. We analyze conditions for the vortex of the initial beam to be transferred efficiently to the generated beam. The propagation of Laguerre-Gaussian (LG) beams possessing OAM states characterized by both azimuthal and radial indices is then investigated for the case where the strong control beam is also an OAM mode. It is shown that the conservation of OAM states is always satisfied over the OAM exchange process. Yet, an abnormal case is observed in which the radial index induces some intensity patterns of the generated beam which differs from a pure LG beam of incident beams. Analytical solutions are provided to elucidate such effects induced by radial indices on propagation characteristics of OAM beams. When superimposing two initially present weak OAM modes, it is observed that the resulting optical vortices move about the beam axis as the light propagates, forming a sort of "constellation" around the center. The shift in axis of such a composite pulses is due to the effect of inter-dot tunneling which is controlled by an external electric voltage. The optical angular momenta may add a new degree of freedom in the study of solid systems suitable for quantum technologies.

References in corpus (18)

• Entanglement of Orbital Angular Momentum States of Photons
• Trans-spectral orbital angular momentum transfer via four wave mixing in Rb vapor
• Coherent control of tunneling in a quantum dot molecule
• Slow light in degenerate Fermi gases
• Spatially dependent electromagnetically induced transparency
• Transfer and storage of vortex states in light and matter waves
• Azimuthal modulation of electromagnetically induced transparency using structured light
• Exchange of optical vortices using an electromagnetically induced transparency based four-wave mixing setup
• Electrical control of inter-dot electron tunneling in a quantum dot molecule
• Transfer of orbital angular momentum of light using two component slow light
• Frequency up-conversion and arbitrary sum arithmetic of lights with orbital angular momentum
• Orbital angular momentum light frequency conversion and interference with quasi-phase matching crystals
• 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
• Slow polaritons with orbital angular momentum in atomic gases
• Light-hole transitions in quantum dots: realizing full control by highly focused optical-vortex beams
• Gaussian Beam-Propagation Theory for Nonlinear Optics - Featuring an Exact Treatment of Orbital Angular Momentum Transfer
• Effective magnetic fields induced by EIT in ultra-cold atomic gases

Cited by in corpus (4)

• Transfer and evolution of structured polarization in a double-V atomic system
• Nonlinear manipulation of orbital angular momentum spectra with second- and third- harmonic generation in a quasi-periodically poled crystal
• Quantum Dot Behaviour under the Influence of Non-Resonant Structured Laser Beams
• Quantum enhancement of qutrit dynamics through driving field and photonic band-gap crystal