16 September 2014 Momentum measurements with holographic optical tweezers for exploring force detection capabilities on irregular samples
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Abstract
We show how measurements of forces through the analysis of light momentum changes can be combined with holographic optical tweezers (HOTs) to leverage the potential of this force detection method. As the magnitude is not derived from the sample displacement, no in situ calibration is required, and measurements are not restricted to specific conditions. In particular, we show that forces on irregular particles and beams can also be measured with optical traps by simultaneously applying a force in the same direction to multiple holographically-trapped particles through a constant flow. Finally, we measure forces exerted on micro-cylinders in order to assess their transversal and longitudinal drag coefficients.
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Frederic Català, Frederic Català, Ferran Marsà , Ferran Marsà , Arnau Farré , Arnau Farré , Mario Montes-Usategui, Mario Montes-Usategui, Estela Martín-Badosa, Estela Martín-Badosa, } "Momentum measurements with holographic optical tweezers for exploring force detection capabilities on irregular samples", Proc. SPIE 9164, Optical Trapping and Optical Micromanipulation XI, 91640A (16 September 2014); doi: 10.1117/12.2061940; https://doi.org/10.1117/12.2061940
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