Optical trapping two types of particles using a focused vortex beam

Zhang, Hanghang; Li, Jinhong; Guo, Miaojun; Duan, Mei-Ling; Feng, Zhifang; Yang, Wen

doi:10.1016/j.ijleo.2018.04.035

Cited by 22 publications

(7 citation statements)

References 32 publications

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“…LG beams can be extensively used in the field of optical rotation for phase-gradient force exerted on particles, and optical information encoding for the intrinsic and extrinsic nature of OAM [3]. Furthermore, the optical binding of low-index and absorbing particles has also been realized by using OVs [4][5][6]. Noncanonical OVs, i.e., fractional OVs, radially polarized fractional vortex beams, and power-exponent-phase vortices, have been presented, and offer new ways of optical manipulation [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Spoon-like Beams Generated with Exponential Phases

Guo

Xia

et al. 2022

Coatings

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In this paper, we report a new kind of beam, named “spoon-like” beams, generated with the exponential phase. The intensity distributions and transverse energy flow of the spoon-like beam at the focal plane are analyzed theoretically and experimentally. The results demonstrate that the size of the spoon-like beam becomes enlarged with the increasing power exponent n, and the length of the spoon-like intensity trajectory becomes shorter with the increasing parameter p. Furthermore, there is an intensity gradient along the spoon-like trajectory of the beam, which introduces the intensity-gradient force exerted onto microparticles. The experiment on optical tweezers demonstrates that the focused beams can create spoon-like traps for the two-dimensional manipulation of particles.

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Section: Introductionmentioning

confidence: 99%

Spoon-like Beams Generated with Exponential Phases

Guo

Xia

et al. 2022

Coatings

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“…Traditional optical tweezers use Gaussian beams, which suffer from diffraction. To overcome the diffraction, some novel manipulation techniques based on nondiffracting beams [ 1 , 2 , 3 , 4 ] have been developed. Bessel beams [ 5 , 6 , 7 , 8 ], a typical nondiffracting beam, can simultaneously trap and manipulate many particles in multiple planes because of their unique properties of nondiffraction and self-healing.…”

Section: Introductionmentioning

confidence: 99%

Optical Force and Torque on a Graphene-Coated Gold Nanosphere by a Vector Bessel Beam

Yan

Ling

et al. 2022

Micromachines

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In the framework of the generalized Lorenz–Mie theory (GLMT), the optical force and torque on a graphene-coated gold nanosphere by a vector Bessel beam are investigated. The core of the particle is gold, whose dielectric function is given by the Drude–Sommerfeld model, and the coating is multilayer graphene with layer number N, whose dielectric function is described by the Lorentz–Drude model. The axial optical force Fz and torque Tz are numerically analyzed, and the effects of the layer number N, wavelength λ, and beam parameters (half-cone angle α0, polarization, and order l) are mainly discussed. Numerical results show that the optical force and torque peaks can be adjusted by increasing the thickness of the graphene coating, and can not be adjusted by changing α0 and l. However, α0 and l can change the magnitude of the optical force and torque. The numerical results have potential applications involving the trapped graphene-coated gold nanosphere.

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“…The potential of sorting enantiomers using an all-optical method would have a profound impact on the drug and pharmaceutical industries, and as such there has been a substantial number of studies looking at enantioselective trapping schemes. These have predominantly involved using an unstructured laser source [8][9][10][11] and/or plasmonic enhancement systems [12][13][14][15][16][17][18][19][20][21][22][23][24] , though there have been a handful of studies employing structured light 20,[25][26][27][28][29] . Optical vortices are inherently chiral, their OAM per photon is where  is known as the topological charge.…”

Section: Introductionmentioning

confidence: 99%

Optical tweezing chiral particles with 3D structured light

Forbes

Green

2022

Nanophotonics IX

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In this work we highlight enantioselective optical gradient forces acting on Rayleigh-seized chiral particles present in 3D structured (non-paraxial) optical vortex tweezing systems. One discriminatory force originates from the circular polarization of the light and is similar to previous chiral optical gradient trapping forces. Much more remarkable is the other which is independent of the input beam's polarization state -even occurring for unpolarized lightand is not present in 2D structured light nor propagating plane waves. This latter chiral sorting mechanism allows for the enantioselective trapping of chiral particles into distinct rings in the transverse plane through conservative radial forces.

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Optical trapping two types of particles using a focused vortex beam

Cited by 22 publications

References 32 publications

Spoon-like Beams Generated with Exponential Phases

Spoon-like Beams Generated with Exponential Phases

Optical Force and Torque on a Graphene-Coated Gold Nanosphere by a Vector Bessel Beam

Optical tweezing chiral particles with 3D structured light

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