Theory of Optical Trapping by an Optical Vortex Beam

Ng, Jack; Lin, Zhifang; Chan, Che Ting

doi:10.1103/physrevlett.104.103601

Cited by 322 publications

(156 citation statements)

References 39 publications

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“…Microparticles can be guided to follow trajectories incommensurate with the flow direction of fluid with the help of the gradient and scattering forces originated from light beams. The use of exotic light beams, in addition to Gaussian beams, has come into prominence for the optical micromanipulation in biological and colloidal sciences [10,16,17]. For instance, the "nondiffracting" Bessel beams have been employed to trap microscopic particles in multiple planes [16].…”

Section: Introductionmentioning

confidence: 99%

Driving a Dielectric Cylindrical Particle With a One Dimensional Airy Beam: A Rigorous Full Wave Solution

Lu¹,

Lin²,

Liu³

2011

PIER

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Abstract-We present a rigorous full wave calculation of the optical force on a dielectric cylindrical particle of an arbitrary size under the illumination of one dimensional (1D) Airy beam. The radiation force is written in terms of the cylindrical partial wave expansion coefficients of the non-paraxial 1D Airy beams. Our simulation results demonstrate that an Airy beam can accelerate the microparticles along its parabolic trajectory, while transverse to which the particles are trapped at the center of its main lobe, corroborating the possibility of the long distance particle transport by means of an Airy beam.

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Section: Introductionmentioning

confidence: 99%

Driving a Dielectric Cylindrical Particle With a One Dimensional Airy Beam: A Rigorous Full Wave Solution

Lu¹,

Lin²,

Liu³

2011

PIER

Self Cite

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“…Because of the OAM of the LG beams, the y-component of the radiation force F y is nonzero, when the particle displacement is along the x direction. In this case, the trap stiffness K i (i.e., the eigen values of the force constant matrix K for i = 1, 2 or 3) can be complex numbers [42]. When Re[K i ] < 0, the trap is single potential well in the focal point.…”

mentioning

confidence: 99%

“…This expression has been used to investigate the properties of strongly focused beams and shows good accuracy [41,42]. The scattering of incident beam is calculated by the GLMT [44,45] and is formulated concisely here.…”

mentioning

confidence: 99%

“…The LG beams carry OAM, which accelerates the particle in the azimuthal direction and strongly affects the trapping stability [42]. The trapping stability is determined by the force constant matrix K = ∇F of the focused beam at the equilibrium position (when R > R trans ).…”

mentioning

confidence: 99%

“…The focused beams violate the paraxial condition, and we perform numerical calculations of the focal field, following the theory developed by Richards and Wolf [41,42]. Figures 1(b) and 1(c) show the light intensity distribution in the focal region.…”

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Optical levitation of nanodiamonds by doughnut beams in vacuum

Zhou

Xiao

Chen

et al. 2017

Laser & Photonics Reviews

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Optically levitated nanodiamonds with nitrogen-vacancy centers promise a high-quality hybrid spinoptomechanical system. However, the trapped nanodiamond absorbs energy form laser beams and causes thermal damage in vacuum. It is proposed here to solve the problem by trapping a composite particle (a nanodiamond core coated with a less absorptive silica shell) at the center of strongly focused doughnut-shaped laser beams. Systematical study on the trapping stability, heat absorption, and oscillation frequency concludes that the azimuthally polarized Gaussian beam and the linearly polarized Laguerre-Gaussian beam LG 03 are the optimal choices. With our proposal, particles with strong absorption coefficients can be trapped without obvious heating and, thus, the spin-optomechanical system based on levitated nanodiamonds are made possible in high vacuum with the present experimental techniques.Introduction-. By trapping, detecting and manipulating nano-and micro-particles [1], optical tweezers are widely used in biophysics [2-4], colloidal sciences [5], chemistry, microfluidic dynamics [6], and fundamental physics [7][8][9][10][11][12][13][14][15]. Because of the wide applicability and high tunablity of the optically levitated systems, several schemes [16] were proposed to realize the ground-state cooling [17], to search for non-Newtonian gravity [18] and to detect gravitational wave [19]. Particularly, it brings about more interesting phenomena and novel applications [20,21] when the trapped particles have internal degrees of freedom (such as spins or electric dipoles) and enter the quantum regime.Optically levitated nanodiamonds with nitrogen-vacancy (NV) centers [22][23][24][25][26] are one of the most promising candidates for implementing a spin-optomechanical hybrid system. In principle, this system can have both long spin coherence time and high quality factor of mechanical oscillation in vacuum. The electron spins of NV centers were shown to have long spin coherence time (in the order of 10 2 µs) even in nanodiamonds of diameter about 20 nm [27]. When trapped in high-vacuum, the dielectric particles are predicted to have ultra-high quality factor Q larger than 10 10 [16,18,28]. Researchers have trapped diamond particles and observed the signal from NV centers in liquid [29,30], in air [31] and very recently in vacuum with pressure down to ∼ kPa [24,25] and ∼ 100 Pa [26].Realizing high quality mechanical oscillation requires trapping the particles in high vacuum (e.g, 10 −6 Pa) to get Q ∼ 10 10 . However, the high-vacuum condition usually causes the thermal damage problem, and experimentally trapping a nanodiamond in high vacuum is still very challenging. Nanodiamonds will absorb energy from the trapping laser beams due to the intrinsic defects [26] and the inevitable imperfections or graphitization [32] on diamond surface. The absorbed energy can hardly be dissipated in a high-vacuum environment, and the nanodiamonds will be quickly heated up significantly [24][25][26], which is unfavorable to the defect centers...

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Controllable Cellular Micromotors Based on Optical Tweezers

Zou

Zheng

et al. 2020

Adv Funct Materials

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Micromotors hold exciting prospects in biomedical applications but still face a great challenge. To date, there have been few reports of micromotors with high safety, flexible controllability, and full biocompatibility. Here, a multifunctional method based on an optical tweezer system is presented to realize controllable cellular micromotors. The method not only satisfies all of the above criteria but is also independent of the cell types and materials. Optical tweezers are used to generate a dynamic scanning optical trap along a given circular trajectory, which can trap and drive a microparticle or a single cell to move along the trajectory and thus generate a microvortex. Cells within the microvortex will be controllably rotated under an action of shear stress or torque and their rotation rate and direction can be controlled by changing the scanning frequency and direction of the dynamic optical trap. The proposed method is effective for both immotile target cells and swimming target cells. Additionally, it is further applied to realize synchronous translation and rotation of cellular micromotors and to assemble controllable and fully biocompatible cellular micromotor assays. The proposed method is believed to have potential applications in targeted drug delivery, biological microenvironment monitoring and sensing, and biomedical treatment.

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Theory of Optical Trapping by an Optical Vortex Beam

Cited by 322 publications

References 39 publications

Driving a Dielectric Cylindrical Particle With a One Dimensional Airy Beam: A Rigorous Full Wave Solution

Driving a Dielectric Cylindrical Particle With a One Dimensional Airy Beam: A Rigorous Full Wave Solution

Optical levitation of nanodiamonds by doughnut beams in vacuum

Controllable Cellular Micromotors Based on Optical Tweezers

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