Simulated dynamic behavior of single and multiple spheres in the trap region of focused laser beams

Gauthier, Robert C.; Ashman, Mike

doi:10.1364/ao.37.006421

Cited by 33 publications

(6 citation statements)

References 39 publications

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“…According to Stokes' law, the output optical power from the movable tweezers versus the trapping force can be calibrated, [17,32] and the results show that when the input optical power increases by 1 mW the trapping force increases by nearly 0.8 pN. Therefore, the calibrated moveable tweezers can not only help the fixed tweezers to trap micro-particles, but also calibrate the fixed tweezers.…”

Section: Methodsmentioning

confidence: 99%

A study of multi-trapping of tapered-tip single fiber optical tweezers

Pan¹,

Lei²,

Liu³

et al. 2014

Chinese Phys. B

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We develop a pair of tapered-tip single fiber optical tweezers, and study its multi-trapping characteristic. The finite difference time domain method is employed to simulate the trapping force characteristic of this pair of single fiber optical tweezers, and the results show that the number of trapped particles depends on the refractive index and the size of the particles. The trapping force of this pair of tapered-tip single fiber optical tweezers is calibrated by the experimental method, and the experimental results are consistent with the theoretical calculation results. The multi-trapping capability realized by the tapered-tip single fiber optical tweezers will be practical and useful for applications in biomedical research fields.

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Section: Methodsmentioning

confidence: 99%

A study of multi-trapping of tapered-tip single fiber optical tweezers

Pan¹,

Lei²,

Liu³

et al. 2014

Chinese Phys. B

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“…A three dimensional model that considers most of the phenomena involved in the experiment is outside the scope of this study. Such a model could include the particle interaction with the trapping light and intermittent changes in the light field after being transmitted by the particles, reflected light [18], heating of the particle and heat transfer to the liquid, and possible thermal effects like convection currents and thermophoresis that can affect the particle trajectory. Also there is a wide range of maximum temperatures reached before the explosion reported by different experiments [19][20][21][22] that depend on many factors like heating rate, liquid purity and heater size.…”

Section: Simplified One Dimensional Modelmentioning

confidence: 99%

Transient trapping of two microparticles interacting with optical tweezers and cavitation bubbles

Carmona-Sosa¹,

Quinto‐Su²

2016

J. Opt.

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In this work we show that two absorbing microbeads can briefly share the same optical trap while creating microscopic explosions. Optical forces pull the particles towards the waist of the trapping beam, once a particle reaches the vicinity of the waist, the surrounding liquid is superheated creating an explosion or cavitation bubble that pushes the particle away while lengthening or shortening the trajectories of the surrounding particles. Hence effectively coupling all the trajectories to each cavitation event. We find that when two microbeads reach the waist simultaneously within a distance of 2.9 µm from the beam center in the transverse plane, a larger explosion might result in ejection from the trap. The measured maximum radial displacements ∆ρc due to cavitation are ∆ρc = 3.9 ± 2.2 µm when the particles reach simultaneously with maximum bubble sizes Rmax = 6.2 ± 3.1 µm, while for individual cases when one of the particles is outside 2.9 µm prior to cavitation ∆ρc is 2.7 ± 1.2 µm and Rmax = 4.2 ± 1.6 µm. We also measure the characteristic timescale of two particle coalescence which is a measure of the expected time that the particles can stay trapped near the waist. The measurements are fitted by a Poisson decaying exponential probability distribution.A simple one dimensional model shows that the characteristic timescales for transient trapping of multiple absorbing particles decrease as more objects are added.

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“…Common types of particle manipulation mechanisms use highly intensified microbeams to propel a single microscopic object [18,19]. Consequently, these mechanisms are capable of generating relatively high migration velocities in microchannels.…”

Section: Introductionmentioning

confidence: 99%

Separation of microparticles suspended in a minichannel using laser radiation pressure

2013

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Optical separation, which is a contactless and accurate technique, has been mostly used to manipulate single particles. This work mainly aims to present an effective technique for optical propulsion and separation of a group of microscopic particles that are suspended in liquids. An experimental study is conducted to assess the effect of radiation pressure of a high-power laser on a dilute dispersion of microparticles in water using microscopic image analysis. Results of separation experiments indicate that the manipulation mechanism is capable of sorting the microscopic particles in two size classes. Compared to common optical separators, this configuration has a benefit of separating many particles simultaneously.

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Simulated dynamic behavior of single and multiple spheres in the trap region of focused laser beams

Cited by 33 publications

References 39 publications

A study of multi-trapping of tapered-tip single fiber optical tweezers

A study of multi-trapping of tapered-tip single fiber optical tweezers

Transient trapping of two microparticles interacting with optical tweezers and cavitation bubbles

Separation of microparticles suspended in a minichannel using laser radiation pressure

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