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26 August 2005 Nonlinear motion of rotating glass fibers
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Abstract
Here we report on the motion of microscopic, optically trapped glass rods suspended in water and experiencing a light torque. The motion consists of two distinct regimes: a linear regime where the rod angle increases linearly with time and a nonlinear regime where the rod angle changes nonlinearly, experiencing accelerations and rapid reversals. These regimes depend on whether the rotation frequency of the linearly polarized driving light is above or below a critical frequency, Ωc. We will present experimental data that spans both regimes. We will also provide a theoretical model that agrees with the observed motion. We are working on extending this effort on the optical trapping and rotation of rods to smaller scales, where the diameter is 100 nm or less. This scaling down will allow us to study the nonlinear motion near a surface. Such studies can help us to understand surface effects that are important in micro- and nanofluidics. Toward this end, we report results on our attempts to trap silver nanorods of diameter close to 100 nm suspended in acetone.
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Keith D. Bonin, W. Andrew Shelton, Douglas Bonessi, and Thad G. Walker "Nonlinear motion of rotating glass fibers", Proc. SPIE 5930, Optical Trapping and Optical Micromanipulation II, 59302B (26 August 2005); https://doi.org/10.1117/12.617259
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