Realization of optical pulling forces using chirality

Ding, Kun; Ng, Jack; Zhou, Lei; Chan, Che Ting

doi:10.1103/physreva.89.063825

Cited by 116 publications

(84 citation statements)

References 56 publications

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“…Examples include the interface between two media [9][10][11], plasmonic interfaces [12,13], and anisotropic materials [14][15][16]. The pulling force also depends on the material of the scattering object and can be accordingly observed for gain [17], chiral [18,19], and structured [20] particles. Experiments with tractor beams [21,22] confirm their importance for optical micromanipulation [23,24].…”

Section: Matter-wave Tractor Beamsmentioning

confidence: 99%

Matter-Wave Tractor Beams

Gorlach

Lavrinenko

et al. 2017

Phys. Rev. Lett.

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Section: Matter-wave Tractor Beamsmentioning

confidence: 99%

Matter-Wave Tractor Beams

Gorlach

Lavrinenko

et al. 2017

Phys. Rev. Lett.

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“…The corresponding trapping force is found using the expression F LjR r −∇U LjR r, which gives a nonzero result, through −∇Ir, unless the intensity of the irradiating beam or its derivative is null. An optical force of this type, and others, acting on chiral particles is currently of significant interest [19][20][21][22].…”

Section: B Potential Energy Of An Electromagnetic Trapmentioning

confidence: 99%

Electromagnetic trapping of chiral molecules: orientational effects of the irradiating beam

Andrews¹

2015

J. Opt. Soc. Am. B

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The photonic interaction generally responsible for the electromagnetic trapping of molecules is forward-Rayleigh scattering, a process that is mediated by transition electric dipoles connecting the ground electronic state and virtual excited states. Higher order electric and magnetic multipole contributions to the scattering amplitude are usually negligible. However, on consideration of chiral discrimination effects (in which an input light of left-handed circular polarization can present different observables compared to right-handed polarization, or molecules of opposite enantiomeric form respond differently to a set circular polarization), the mechanism must be extended to specifically accommodate transition magnetic dipoles. Moreover, it is important to account for the fact that chiral molecules are necessarily nonspherical, so that their interactions with a laser beam will have an orientational dependence. Using quantum electrodynamics, this article quantifies the extent of the energetic discrimination that arises when chiral molecules are optically trapped, placing particular emphasis on the orientational effects of the trapping beam. An in-depth description of the intricate ensemble-weighted method used to incorporate the latter is presented. It is thus shown that, when a mixture of molecular enantiomers is irradiated by a continuous beam of circularly polarized light, a difference arises in the relative rates of migration of each enantiomer in and out of the most intense regions of the beam. As a consequence, optical trapping can be used as a means of achieving enantiomer separation.

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“…In recent years, optical forces [1,2,3,4,5,6,7,8,9,10,11,12] in different structures and devices have been a subject of great interest because of theirs application in optical tweezers [2,3,4], tractor beams [5], etc. Most of these studies have been focused on the structures composed of passive materials [3,4], whereas forces on active media have received little attention.…”

Section: Introductionmentioning

confidence: 99%

“…[9,10]. Active media [13,14] may be modeled by chiral media with a large imaginary part of chirality parameter [5,6,7,8]. The chirality parameter may reverse the sign of the optical forces.…”

Section: Introductionmentioning

confidence: 99%

The distribution of electromagnetic waves and forces in a dispersive chiral cylinder

Wang

et al. 2016

IEICE Electron. Express

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By introducing the effects of bound electric and magnetic charges, the mechanical interaction between waves and a chiral cylinder is investigated with the auxiliary differential equations finite-difference timedomain method. The trapping Lorentz force density distributions of an active chiral cylinder, as well as a core-shell cylinder consisting of a chiral shell and a dielectric core illuminated by a normally incident plane wave are simulated. Numerical results show that the working principle is based on gradient forces generated by the continuously coupled cross-polarized waves. This finding may provide a promising avenue in chirality detection and sorting chiral particles from achiral ones. Keywords: chiral media, electromagnetic, optics, dispersion Classification: Optical systems References[1] A. Ashkin, et al.: "Observation of a single-beam gradient force optical trap for dielectric particles," Opt. Lett. 11 (1986)

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Realization of optical pulling forces using chirality

Cited by 116 publications

References 56 publications

Matter-Wave Tractor Beams

Matter-Wave Tractor Beams

Electromagnetic trapping of chiral molecules: orientational effects of the irradiating beam

The distribution of electromagnetic waves and forces in a dispersive chiral cylinder

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