Results 131 to 140 of about 888 (159)
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Holographic optical tweezers in the Fresnel regime
SPIE Proceedings, 2004We present a flexible setup for steering of laser tweezers using a high resolution spatial light modulator (SLM). Moving of e.g. trapped cells in the focal plane of the microscope objective is possible without the need for time consuming re-calculation of holograms.
Alexander Jesacher +3 more
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On-demand vector holographic optical tweezers
Optical Trapping and Optical Micromanipulation XVI, 2019The invention of holographic optical tweezers (HOTs) revolutionized the field of optical tweezers by allowing the simultaneous manipulation of many particles using arrays of scalar beams. Here, we go one step further and produce arrays of digitally controlled Higher-Order Poincare Sphere (HOPs) beams employing a simple set-up using a spatial light ...
Nkosiphile Bhebhe +4 more
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Multiplexed spectroscopy with holographic optical tweezers
SPIE Proceedings, 2014We have developed a multiplexed holographic optical tweezers system with an imaging spectrometer to manipulate multiple optically trapped nanosensors and detect multiple fluorescence spectra. The system uses a spatial light modulator (SLM) to control the positions of infrared optical traps in the sample so that multiple nanosensors can be positioned ...
Matthew A. Cibula, David H. McIntyre
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Trapping and manipulation of bubbles with holographic optical tweezers
Soft MatterA robust methodology for trapping low-index objects is introduced, employing holographical optical tweezers with a ray-tracing theoretical framework. This enables a one-time trap stiffness calibration.
Juan Manuel Molina-Jiménez +4 more
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2012
Holographic optical tweezers (HOT) employ a relatively simple form of holographic beam-shaping that produces discrete, point-like intensity peaks in the optical trapping plane, each of which acts as a single optical tweezer. For each tweezer, lateral position and axial position can be determined individually by means of accordingly prepared holograms ...
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Holographic optical tweezers (HOT) employ a relatively simple form of holographic beam-shaping that produces discrete, point-like intensity peaks in the optical trapping plane, each of which acts as a single optical tweezer. For each tweezer, lateral position and axial position can be determined individually by means of accordingly prepared holograms ...
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Cluster formation in ferrofluids induced by holographic optical tweezers
Optics Letters, 2013Holographic optical tweezers were used to show the interaction between a strongly focused laser beam and magnetic nanoparticles in ferrofluid. When the light intensity was high enough, magnetic nanoparticles were removed from the beam center and formed a dark ring. The same behavior was observed when focusing vortex or Bessel beams.
Jan, Masajada +2 more
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Moving average process underlying the holographic–optical–tweezers experiments
Applied Optics, 2013We study the statistical properties of recordings that contain time-dependent positions of a bead trapped in optical tweezers. Analysis of such a time series indicates that the commonly accepted model, i.e., the autoregressive process of first-order, is not sufficient to fit the data.
Jakub, Ślęzak +3 more
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Defining the trapping limits of holographical optical tweezers
Journal of Modern Optics, 2004Abstract We report on the limitations of using a spatial light modulator (SLM) within optical tweezers to produce both lateral and axial displacements. We find that lateral displacements of optical traps are limited by the optical efficiency of the SLM, whereas the axial displacements are limited by the abberations of the objective lens.
G. Sinclair +4 more
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Laser Tweezers and Holographic Optical Trapping
Optics and Photonics News, 2009Tractor beams have long been a staple of science fiction, and now they have a real-life equivalent on the micro-scale. Laser tweezers can trap and hold tiny objects in three dimensions and may one day be used to manufacture micro- and nano-scale products.
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Improving Spot Uniformity in Holographic Optical Tweezers
Optics in the Life Sciences, 2011We have developed a method for compensating for crosstalk between adjacent pixels in liquid crystal based spatial light modulators. The method decreases the uniformity error of the trap intensities in holographic optical tweezers (HOT) systems.
Martin Persson +3 more
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