Journal Article10.1007/S10043-996-0011-Z
Measurements of Optical Trapping Efficiency for Micron-Sized Dielectric Particles in Various Surrounding Media
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TL;DR: In this article, the maximum axial trapping efficiency of polystyrene latex spheres having a diameter of 2-15μm has been measured in water, ethanol, butanol and octanol.
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Abstract: The maximum axial trapping efficiency Qmax has been measured in water, ethanol, butanol and octanol for polystyrene latex spheres having a diameter of 2–15μm. The effects of the diameter of the particle as well as the refractive index and the viscosity of surrounding medium have been investigated. For particles of d≥7 μm, Qmax is almost independent of particle size, while it decreases as the diameters decrease to d≦5 μm. It is also noted that Qmax is affected by the viscosity rather than the refractive index of the surrounding medium.
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Citations
Observation of a single-beam gradient-force optical trap for dielectric particles in air
TL;DR: A single-beam gradient-force optical trap for dielectric particles, which relies solely on the radiation pressure force of a TEM(00)-mode laser light, is demonstrated in air for what is believed to be the first time.
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TL;DR: In this article, the authors evaluated the axial and transverse stiffness of optical tweezers using radial polarization and found that radial polarization enhances axial trapping properties while reducing the transverse trapping properties.
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Forces of a Single-Beam Gradient-Force Optical Trap on Dielectric Spheroidal Particles in the Geometric-Optics Regime
TL;DR: In this article, the authors developed a computational code to calculate the forces of a single-beam gradient-force optical trap exerted on dielectric ellipsoidal particles in the geometric-optics regime.
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Optical trappings of ThO2 and UO2 particles using radiation pressure of a visible laser light
TL;DR: In this article, a simulation code based on geometrical optics was proposed to predict the optical trapping characteristics for ThO 2 and UO 2 particles in water using the radiation pressure of a TEM oo -mode He-Ne laser beam of λ=633 nm.
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References
Observation of a single-beam gradient force optical trap for dielectric particles
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TL;DR: It is shown that good trapping requires high convergence beams from a high numerical aperture objective and a comparison is given of traps made using bright field or differential interference contrast optics and phase contrast optics.
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Bead movement by single kinesin molecules studied with optical tweezers
TL;DR: The results of this study are consistent with a model in which kinesin detaches briefly from the microtubule during a part of each mechanochemical cycle, rather than a models in whichKinesin remains bound at all times.
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Optical trapping of metallic Rayleigh particles.
Karel Svoboda,Steven M. Block +1 more
TL;DR: Comparison of trapping forces for latex and gold spheres demonstrates that the gradient force is the major determinant of trapping strength and that competing effects, such as scattering or radiometric forces, are relatively minor.
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Force generation of organelle transport measured in vivo by an infrared laser trap.
TL;DR: The feasibility of using controlled manipulation of actively translocating organelles to measure direct force is demonstrated and the force driving a single organelle along microtubules is determined, allowing the force generated by a single motor to be 2.6 × 10-7 dynes.
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