Helicity-dependent three-dimensional optical trapping of chiral microparticles

Tkachenko, Georgiy; Brasselet, Étienne

doi:10.1038/ncomms5491

Cited by 114 publications

(76 citation statements)

References 36 publications

(46 reference statements)

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“…As one of the most fundamental physical quantities in classical and quantum electrodynamics, orbital angular momentum (OAM) of light has initiated widespread interest in many areas, including optical tweezers [1], atom manipulation [2][3][4], nanoscale microscopy [5], quantum information processing, and large-capacity optical communication [6][7][8]. A beam of light carrying OAM possesses a phase φ(l,ϕ) = exp(ilϕ) in the transverse plane, where ϕ is the azimuth angle and l is the topological charge number.…”

Section: Introductionmentioning

confidence: 99%

Controllable all-fiber generation/conversion of circularly polarized orbital angular momentum beams using long period fiber gratings

et al. 2017

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Mode-division multiplexing (MDM) is a promising technology for increasing the data-carrying capacity of a single few-mode optical fiber. The flexible mode manipulation would be highly desired in a robust MDM network. Recently, orbital angular momentum (OAM) modes have received wide attention as a new spatial mode basis. In this paper, we firstly proposed a long period fiber grating (LPFG) system to realize mode conversions between the higher order LP core modes in four-mode fiber. Based on the proposed system, we, for the first time, demonstrate the controllable all-fiber generation and conversion of the higher order LP core modes to the first and second order circularly polarized OAM beams with all the combinations of spin and OAM. Therefore, the proposed LPFG system can be potentially used as a controllable higher order OAM beam switch and a physical layer of the translating protocol from the conventional LP modes communication to the OAM modes communication in the future mode carrier telecommunication system and light calculation protocols.

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Section: Introductionmentioning

confidence: 99%

Controllable all-fiber generation/conversion of circularly polarized orbital angular momentum beams using long period fiber gratings

et al. 2017

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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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“…Currently, there is much interest in the application of such a gradient trapping force to solid chiral microparticles, for example, in connection with the observation of the internal helical structure of such particles [1,2], the production of an omnidirectional chiral mirror to enable optomechanical effects [3], and the selective manipulation of chiral objects dependent on photon helicity [4]. This paper, in contrast, deals with the optical trapping of chiral molecules or Rayleigh particles at the nanoscale, which requires a consideration of individual photonmatter interactions in the form of forward-Rayleigh scattering [5][6][7][8], namely, the concerted annihilation and creation of photons with identical energy and wave-vector.…”

Section: Introductionmentioning

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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Helicity-dependent three-dimensional optical trapping of chiral microparticles

Cited by 114 publications

References 36 publications

Controllable all-fiber generation/conversion of circularly polarized orbital angular momentum beams using long period fiber gratings

Controllable all-fiber generation/conversion of circularly polarized orbital angular momentum beams using long period fiber gratings

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

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

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