Guiding of atoms in helical optical potential structures

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

doi:10.1088/0953-4075/49/12/125002

Cited by 14 publications

(9 citation statements)

References 34 publications

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“…It should be noted that the helical potential tubes are not the exclusive property of Bessel beams. 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].…”

Section: A Potentialmentioning

confidence: 58%

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 Potentialmentioning

confidence: 58%

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

Radożycki¹

2019

Phys. Rev. A

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“…This type of light field is characterised by bright petal-like regions in a plane transverse to the propagation direction, and by using LG beams with different indices l and p it is possible to create dark lattices of different geometrical patterns [100,101]. Furthermore, it has been shown that counter-propagating beams in three dimensions would lead to exotic light fields where the bright regions have the form of helical tubes twisted along the beams' propagation direction [149][150][151][152][153][154]. However, prior to the proposal of the optical Ferris wheel field, bright ring-shaped lattices had been used in optical tweezing experiments [155,156].…”

Section: Ferris Wheelsmentioning

confidence: 99%

Atoms in complex twisted light

Babiker

Andrews

Lembessis

2018

J. Opt.

145

116

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The physics of optical vortices, also known as twisted light, is now a well-established and a growing branch of optical physics with a number of important applications and significant interdisciplinary connections. Optical vortex fields of widely varying forms and degrees of complexity can be realised in the laboratory by a host of different means. The interference between such beams with designated orbital angular momenta and optical spins (the latter is associated with wave polarisations) can be structured to conform to various geometrical arrangements. The focus of this review is on how such tailored forms of light can exert a controllable influence on atoms with which they interact. The main physical effects involve atoms in motion due to application of optical forces. The now mature area of atom optics has had notable successes both of fundamental nature and in applications such as atom lasers, atom guides and Bose-Einstein condensates. The concepts in atom optics encompass not only atomic beams interacting with light, but atomic motion in general as influenced by optical and other fields. Our primary concern in this review is on atoms in structured light where, in particular, the twisted nature of the light is made highly complex with additional features due to wave polarisation. These features bring to the fore a variety of physical phenomena not realisable in the context of atomic motion in more conventional forms of laser light. Atoms near resonance with such structured light fields become subject to electromagnetic fields with complex polarisation and phase distributions, as well as intricately structured intensity gradients and radiative forces. From the combined effect of optical spin and orbital angular momenta, atoms may also experience forces and torques involving an interplay between the internal and centre of mass degrees of freedom. Such interactions lead to new forms of processes including scattering, trapping and rotation and, as a result, they exhibit characteristic new features at the micro-scale and below. A number of distinctive properties involving angular momentum exchange between the light and the atoms are highlighted, and prospective applications are discussed. Comparison is made between the theoretical predictions in this area and the corresponding experiments that have been reported to date.

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“…The synchronized modes of empty resonator form an almost perfect periodic lattice of dark spots [9]. Each dark spot is surrounded by a nearly circular flow resembling isolated optical vortex alike Laguerre-Gaussian beam [21,22]. The phase of optical field is a precise indicator of electromagnetic energy circulation [23].…”

Section: Singular Lattices and Their Vibrationsmentioning

confidence: 99%

Configuration of vortex-antivortex lattices at output mirror of wide-area microchip laser

Okulov

2019

J. Phys.: Conf. Ser.

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Square vortex lattices predicted theoretically and experimentally observed in diode-pumped solid state microchip lasers are shown to have a remarkable symmetry. These lattices are formed by counter-rotating vortices. The interaction of vortices with nonlinear gain medium leads to precession of vortices and collective excitations with dynamics identical to acoustical and optical vibrations of atomic lattices.

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Guiding of atoms in helical optical potential structures

Cited by 14 publications

References 34 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

Atoms in complex twisted light

Configuration of vortex-antivortex lattices at output mirror of wide-area microchip laser

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