Theoretical investigation of the optical trapping properties of a micro-optic cubic glass structure

Gauthier, Robert C.; Frangioudakis, Athanasios

doi:10.1364/ao.39.003060

Cited by 13 publications

(6 citation statements)

References 14 publications

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“…Cubic shapes have one stable equilibrium with their corners aligned with the beam axis (also along the longest diagonal). 15 Combining shape and internal birefringence, microstructured objects have been controlled and rotated with linear and circular polarization, incorporating the interplay of torques due to the shape and internal birefringence. [16][17][18] These investigations using polarized light interacting with birefringent objects have been limited to birefringent crystal fragments, birefringent spheres, and micro-fabricated birefringent crystals.…”

Section: Introductionmentioning

confidence: 99%

“…Cylindrical shapes were shown to orient themselves with their longest axis along the beam, 12 – 14 and as the aspect ratio of the width to length increased, they maintained the longest diagonal along the beam axis. Cubic shapes have one stable equilibrium with their corners aligned with the beam axis (also along the longest diagonal) 15 . Combining shape and internal birefringence, microstructured objects have been controlled and rotated with linear and circular polarization, incorporating the interplay of torques due to the shape and internal birefringence 16 …”

Section: Introductionmentioning

confidence: 99%

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Equilibrium positions of optically trapped single-crystal uniaxial calcite

Wahmann,

Herne

2024

Opt. Eng.

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Precision in optical micromanipulation is critical for non-invasive, non-contact control of objects with light and for using light to measure forces and torques. We demonstrate the control of birefringent objects over three translational directions and three rotational degrees of freedom. Our work trapping and rotating calcite, a unique crystal with no axis of symmetry, extends the positioning abilities of optical tweezers. We trap and levitate a single crystal in linearly polarized light and position it in three rotational directions relative to the polarization. Our model of the torque on the crystals is based on determining the induced polarization and its interaction with the incident electric field. Crystals are shown to rest in equilibrium with their optic axis along the beam axis and one extraordinary axis along the direction of polarization. The calculated equilibrium positions align with our observations of stable trapped calcite.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Equilibrium positions of optically trapped single-crystal uniaxial calcite

Wahmann,

Herne

2024

Opt. Eng.

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“…Thus, the beam can carry either linear or angular momentum depending on the polarization state of the trapping beam. In optical tweezers, trapped particles are made to spin by transference of this angular momentum 18–21 . In our experiments, we have studied linear polarization effects on the lateral trap stiffness of a trapped polystyrene bead under the influence of ultrafast pulse train.…”

Section: Introductionmentioning

confidence: 99%

Polarization induced control of optical trap potentials in binary liquids

Mondal

Dinda

Bandyopadhyay

et al. 2019

Sci Rep

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We illustrate control of a polarized laser optical trapping potential landscape through the nonideal mixing of binary liquids. The inherent trapping potential asymmetry (ITPA) present in the trapping region results from the asymmetric intensity distribution in focal volume due to the high numerical aperture objective lens. Experimentally, we show that this ITPA effect can be modified and/or removed by the use of binary liquid mixtures. From our femtosecond optical tweezers experiments, we determine the topograph of the trapping potential base on the fluctuation-dissipation theorem. Additionally, the Brownian motion of the trapped bead is sensitive to the frictional force (FF) of the surroundings that is exerted by clusters of water and alcohol binary mixture through extended hydrogen bonding. Thus, using these two effects, ITPA and FF of the medium, we have shown that one can indeed modify the effective trapping potential landscape. Water-alcohol binary mixtures display a nonlinear dependence on the microrheological properties of the solvent composition as a result of rigid cluster formation. Volumetrically, at about 30% methanol in water binary mixture, the trapping asymmetry is minimal. In this particular binary mixture composition, the hydrophobic part of the methanol molecule is surrounded by ‘cages’ of water molecules. Enhanced H-bonding network of water molecules results in higher viscosity, which contributes to the higher frictional force. Increased viscosity decreases the degree of anisotropy due to hindered dipolar rotation. However, at higher methanol concentrations, the methanol molecules are no longer contained within the water cages and are free to move, which decrease their overall bulk viscosity. Thus, for pure solvents, experimentally measured anisotropy matches quite well with the theoretical prediction, but this fails in case of the binary mixtures due to the increased frictional force exerted by binary mixtures that result from the formation of cage-like structures.

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“…Later the same author presented the term "point ray" to improve rationality of the model [7]. Gauthier discussed the behaviors of many micro-objects in the laser beams with this model, such as spheres, rings, cylinders and cubes [8]. However, the theoretical investigations have been focused on basic geometries such as spheres, near-spheres, etc.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Calculation of Laser Driving 3-D Microrotors

Liu¹,

Zhu²,

Wenhao³

2006

JLMN

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In this paper, we propose the new theoretical investigation on the optical forces and torques on complex microrotors. Based on R. C. Gauthier's modified ray model, the optical forces and toques on a complex micro-object, the conical microrotor, are analyzed. The viscous drag torque is estimated by Stokes flow to obtain the rotational speed. The results of our computation agree well with the previously published experimental results, which indicates that our approach of the optical torque calculation is suitable for complex microrotors and that the theoretical calculation is very helpful to optimum design of light-driven microrotors. The primary experimental results of one kind of microrotors driven are also presented.

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Theoretical investigation of the optical trapping properties of a micro-optic cubic glass structure

Cited by 13 publications

References 14 publications

Equilibrium positions of optically trapped single-crystal uniaxial calcite

Equilibrium positions of optically trapped single-crystal uniaxial calcite

Polarization induced control of optical trap potentials in binary liquids

Theoretical Calculation of Laser Driving 3-D Microrotors

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