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- W2067492004 abstract "For optical tweezers, especially when used in biological studies, optimizing the trapping efficiency reduces photo damage or enables the generation of larger trapping forces. One important, yet not-well understood, tuning parameter is how much the laser beam needs to be expanded before coupling it into the trapping objective. Here, we measured the trap stiffness for 0.5-2 μm-diameter microspheres for various beam expansions. We show that the highest overall trapping efficiency is achieved by slightly under-filling a high-numerical aperture objective when using microspheres with a diameter corresponding to about the trapping-laser wavelength in the medium. The optimal filling ratio for the lateral direction depended on the microsphere size, whereas for the axial direction it was nearly independent. Our findings are in agreement with Mie theory calculations and suggest that apart from the choice of the optimal microsphere size, slightly under-filling the objective is key for the optimal performance of an optical trap." @default.
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- W2067492004 date "2012-01-01" @default.
- W2067492004 modified "2023-09-26" @default.
- W2067492004 title "Under-Filling Trapping Objectives Optimizes the use of Available Laser Power in Optical Tweezers" @default.
- W2067492004 doi "https://doi.org/10.1016/j.bpj.2011.11.3157" @default.
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