Characterization of periodic cavitation in optical tweezers

Carmona-Sosa, Viridiana; Alba-Arroyo, J. E.; Quinto‐Su, Pedro A.

doi:10.1364/ao.55.001894

Cited by 4 publications

(3 citation statements)

References 23 publications

(32 reference statements)

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“…The threshold is selected [12] with a value that is 90% that of the background, this is followed by fitting the located boundary to a circle. The measurement can be used with the Rayleigh formula to estimate the lifetime of the bubbles (few microseconds) which we found has a linear dependence with measurements done with a fast photodiode [10].…”

Section: Methodsmentioning

confidence: 73%

“…The experiments are done in a near IR optical tweezers setup described in [8,10]. The trapping laser wavelength is 975 nm and it is focused by a 100×/1.25 NA microscope objective with a transmitted power of 62 mW where single particles can be trapped for a longer time.…”

Section: Methodsmentioning

confidence: 99%

“…Hence, in those cases the time for particle pair coalescence decreases. To estimate the decrease in time for a particle pair coalescing in the case of three particles oscillating in a single optical trap we use a simple one-dimensional model that only considers the optical force and an empirical model for the interaction between bubble and particles [9,10].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 73%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Carmona-Sosa¹,

Quinto‐Su²

2016

J. Opt.

Self Cite

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All-fiber impurity collector based on laser-induced microbubble

Liu

Lei

Liu

et al. 2019

Optics Communications

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Optical trapping of microparticles with two tilted-focused laser beams

Meng

Zhang

et al. 2023

Review of Scientific Instruments

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We present an optical method for the manipulation of microparticles using two tilted-focused beams. First, the action on the microparticles is studied with a single tilted-focused beam. The beam is used to drive the directional motion of a dielectric particle. When the optical scattering force is larger than the optical gradient force, the particle is pushed to the tilted side of the optical axis by the optical force. Second, two tilted-focused beams with the same power and complementary tilt angles are used to assemble an optical trap. The trap can be used to realize the optical trapping of the dielectric particles and opto-thermal trapping of the light absorbing particles. The trapping mechanism is the balance of the forces exerted on the particles, including the optical scattering force, optical gradient force, gravity, and thermal gradient force. The trap center is away from the focal spots, which effectively prevents the laser beam from being focused on the trapped object.

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Characterization of periodic cavitation in optical tweezers

Cited by 4 publications

References 23 publications

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

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

All-fiber impurity collector based on laser-induced microbubble

Optical trapping of microparticles with two tilted-focused laser beams

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