Rotating optical tubes for vertical transport of atoms

Rsheed, Anwar Al; Lyras, A.; Aldossary, Omar M.; Lembessis, V. E.

doi:10.1103/physreva.94.063423

Cited by 16 publications

(12 citation statements)

References 20 publications

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“…A comparable potential pattern, for a two-level atom, was found for the superposition of two counter-propagating Laguerre-Gaussian beams of opposite helicity [49]. Such atoms can then be transported if the entire helical structure is made rotating due to the slight detuning of the beams frequencies [50]. The same effect in our case was mentioned at the beginning of this section.…”

Section: A Potentialsupporting

confidence: 79%

Manipulating neutral particles in Bessel beams: From rings, through fixed helices, to three-dimensional traps

Radożycki¹

2019

Phys. Rev. A

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The motion of neutral, polarizable atoms (also called neutral particles in this work) in the field of the Bessel beam is considered. It is shown in the numerical way, that the Bessel rings, i.e., the regions of high energy concentration can trap particles of positive polarizability (atoms in reddetuned beams). This trapping occurs only in the plane perpendicular to the wave propagation, and the motion along the beam is unrestricted. When the beam is superposed with the plane wave of the same frequency propagating in the same direction, the particles are guided along helices, fixed in space. The shape of these helices depends on the parameters characterizing the electromagnetic fields but not on the initial state of guided particles. Depending on the vorticity of the Bessel beam, these helices can be made left or right-handed. In the special case of zero vorticity, the helices get degenerated to the true, three-dimensional rings, which can serve as 3D traps. The emerging structure of potential valleys can be applied to parallel guidance or capture several independent atoms, each in its own trap.

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Section: A Potentialsupporting

confidence: 79%

Manipulating neutral particles in Bessel beams: From rings, through fixed helices, to three-dimensional traps

Radożycki¹

2019

Phys. Rev. A

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“…The detailed pattern of phase dislocations, wavefronts and effective fields of velocities of such lattices [42] demonstrated the vortex pairing ( fig.6). The effective magnetic fields B which may be realized with such vortex configurations [53,54] associated with the each phaselocked vortex are counter-directed for adjacent vortices. This happens in contrast to conventional Abrikosov vortex lattices [5] where all vortices produce co-rotating currents around magnetic field lines.…”

Section: Periodic Transverse Structures In Laser Cavities Obtainedmentioning

confidence: 99%

Structured light entities, chaos and nonlocal maps

Okulov

2020

Chaos, Solitons & Fractals

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Spatial chaos as a phenomenon of ultimate complexity requires the efficient numerical algorithms. For this purpose iterative low-dimensional maps have demonstrated high efficiency. Natural generalization of Feigenbaum and Ikeda maps may include convolution integrals with kernel in a form of Green function of a relevant linear physical system. It is shown that such iterative nonlocal nonlinear maps are equivalent to ubiquitous class of nonlinear partial differential equations of Ginzburg-Landau type. With a Green functions relevant to generic optical resonators these nonlocal maps emulate the basic spatiotemporal phenomena as spatial solitons, vortex eigenmodes breathing via relaxation oscillations mediated by noise, vortex-vortex and vortex-antivortex lattices with periodic location of vortex cores. The smooth multimode noise addition facilitates the selection of stable entities and elimination of numerical artifacts.

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“…The OAM property of this type of laser light is in addition to the wave polarisation, or optical spin angular momentum (SAM) property, (see [8] to [10]). In this context both atomic and nanoparticle manipulation have revealed additional effects, with the OAM features manifesting themselves as rotational motion, and new atom trapping and cooling as well as channelling techniques have emerged (see [11] to [24]). The optical spanner is one of the first applications which has been realised as the rotational form of the optical tweezers (see [12] to [18]).…”

Section: Introductionmentioning

confidence: 99%

Interference of axially-shifted Laguerre–Gaussian beams and their interaction with atoms

Köksal

Lembessis

Yuan

et al. 2019

J. Opt.

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Counter-propagating co-axial Laguerre-Gaussian (LG) beams are considered, not in the familiar scenario where the focal planes coincide at z = 0, but when they are separated by a finite distance d. In the simplest case where both beams have the same linear polarization the total fields are shown to display novel amplitude and phase distributions in the form of a finite ring lattice. When the beams have slightly different frequencies the interference pattern becomes a set of rotating rings in a manner resembling Ferris wheels and the whole pattern also moves axially between the focal planes. The utility of such axially-shifted counter-propagating LG beams stems from their novel optical forces, their torques and their trapping potentials which act on atoms between the focal planes. (PACS Numbers: 42.50Tx; 42.50.Wk; 78.68.+m; 37.10.De; 37.10.Vz)

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Rotating optical tubes for vertical transport of atoms

Cited by 16 publications

References 20 publications

Manipulating neutral particles in Bessel beams: From rings, through fixed helices, to three-dimensional traps

Manipulating neutral particles in Bessel beams: From rings, through fixed helices, to three-dimensional traps

Structured light entities, chaos and nonlocal maps

Interference of axially-shifted Laguerre–Gaussian beams and their interaction with atoms

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