Holographic aberration correction: optimising the stiffness of an optical trap deep in the sample
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TL;DR: The effects of 1(st) order spherical aberration and defocus upon the stiffness of an optical trap tens of μm into the sample are investigated and a specific non-trivial combination of defocus and axial objective position is selected.
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Abstract: We investigate the effects of 1st order spherical aberration and defocus upon the stiffness of an optical trap tens of μm into the sample. We control both these aberrations with a spatial light modulator. The key to maintain optimum trap stiffness over a range of depths is a specific non-trivial combination of defocus and axial objective position. This optimisation increases the trap stiffness by up to a factor of 3 and allows trapping of 1μm polystyrene beads up to 50μm deep in the sample.
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Citations
Zero-order free holographic optical tweezers.
TL;DR: In this article , a cost-effective zero-order free holographic optical tweezers (HOTs) was constructed, thanks to a homemade asymmetric triangle reflector and a digital lens, which performs excellently in generating complex light fields and manipulating particles.
3
Nonlinear refractive index measurement of a trapped particle with Shack–Hartmann wavefront sensor
TL;DR: In this article, a technique for nonlinear refractive index measurement of a single trapped nanoparticle is investigated using Shack-Hartmann sensor, where a trapping laser is used as a probe beam and an interacting green laser is illuminated as a pumping beam.
2
Freestyle laser traps: Applications and future outlook
José Rodrigo,Tatiana Alieva +1 more
- 01 Jul 2016
TL;DR: In this article, a freestyle laser trap combines high intensity and phase gradient forces to confine and transport multiple particles along three-dimensional trajectories, and the trajectories as well as the motion of the particles can be designed and controlled according to the considered application.
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Optimal In-depth trapping by tuning the correction collar of a dry objective lens
TL;DR: In this paper , a dry objective was used for optimal trapping of even sub-micrometer objects, such as polystyrene beads with radii of 270 and 175 nm in 3D.
1
References
Focusing coherent light through opaque strongly scattering media
Ivo M. Vellekoop,Allard Mosk +1 more
TL;DR: Focusing of coherent light through opaque scattering materials by control of the incident wavefront with a brightness up to a factor of 1000 higher than the brightness of the normal diffuse transmission is reported.
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Dynamic holographic optical tweezers
TL;DR: In this article, the authors describe methods for creating large numbers of high-quality optical traps in arbitrary three-dimensional configurations and for dynamically reconfiguring them under computer control, allowing for mixed arrays of traps based on different modes of light, including optical vortices, axial line traps, optical bottles and optical rotators.
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In situ wavefront correction and its application to micromanipulation
TL;DR: In this article, a generic method based on complex modulation for true in situ wavefront correction that allows compensation of all aberrations along the entire optical train is proposed for the field of micromanipulation, which is very sensitive to wavefront distortions.
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Holographic optical tweezers and their relevance to lab on chip devices.
TL;DR: Holographic optical tweezers can trap and move many objects simultaneously and their compatibility with other optical techniques, particularly microscopy, means that they are highly appropriate to lab-on-chip systems to enable optical manipulation, actuation and sensing.
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Trapping forces, force constants, and potential depths for dielectric spheres in the presence of spherical aberrations
TL;DR: A theoretical model predicts trapping forces, force constants, and trapping potential depths for dielectric spheres with diameters smaller than or equal to the wavelength of the trapping light and finds that all three parameters decrease when the distance to the coverslip increases.
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