Transfer of angular momentum of guided light to an atom with an electric quadrupole transition near an optical nanofiber

Abstract

We study the transfer of angular momentum of guided photons to a two-level atom with an electric quadrupole transition near an optical nanofiber. We show that the generation of the axial orbital torque of the driving guided field on the atom is governed by the internal-state selection rules for the quadrupole transition and by the angular momentum conservation law with the photon angular momentum given in the Minkowski formulation. We find that the torque depends on the photon angular momentum, the change in the angular momentum of the atomic internal state, and the quadrupole-transition Rabi frequency. We calculate numerically the torques for the quadrupole transitions between the sublevel $M=2$ of the hyperfine-structure level $5S_{1/2}F=2$ and the sublevels $M^{\prime }=0$, 1, 2, 3, and 4 of the hyperfine-structure level $4D_{5/2}{F}^{\prime }=4$ of a ${}^{87}$Rb atom. We show that the absolute value of the torque for the higher-order mode HE${}_{21}$ is larger than that of the torque for the fundamental mode HE${}_{11}$ except for the case $M^{\prime }-M=2$, where the torque for the mode HE${}_{21}$ is vanishing.

References in corpus (27)

• Vortex formation in a stirred Bose-Einstein condensate
• Quantized Rotation of Atoms From Photons with Orbital Angular Momentum
• Quantum dynamics of cold trapped ions, with application to quantum computation
• Observation of persistent flow of a Bose-Einstein condensate in a toroidal trap
• A quantum memory for orbital angular momentum photonic qubits
• Photon recoil momentum in dispersive media
• Spatially dependent electromagnetically induced transparency
• Transferring orbital and spin angular momenta of light to atoms
• Collapses and revivals of stored orbital angular momentum of light in a cold atomic ensemble
• Off-axis excitation of hydrogenlike atoms by twisted photons
• Entanglement of orbital angular momentum states between an ensemble of cold atoms and a photon
• Optical Nanofibers: a new platform for quantum optics
• Optical nanofibres and neutral atoms
• Angular momenta, helicity, and other properties of dielectric-fiber and metallic-wire modes
• Fluctuation-induced forces on an atom near a photonic topological material
• Electromagnetic Momentum in Dispersive Dielectric Media
• Observation of the ${}^{87}$Rb $5S_{1/2}$ to $4D_{3/2}$ electric quadrupole transition at 516.6 nm mediated via an optical nanofibre
• Mass-polariton theory of sharing the total angular momentum of light between the field and matter
• Spontaneous lateral atomic recoil force close to a photonic topological material
• Higher-order modes of vacuum-clad ultrathin optical fibers
• Enhancement of the quadrupole interaction of an atom with guided light of an ultrathin optical fiber
• Optical torque on a two-level system near a strongly nonreciprocal medium
• Light-driven mass density wave dynamics in optical fibers
• Quadrupole absorption rate and orbital angular momentum transfer for atoms in optical vortices
• Casimir-Polder induced Rabi oscillations
• Torque of guided light on an atom near an optical nanofiber
• Optical angular momentum in atomic transitions: a paradox