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Nonlinear Motion of Rotating Glass Fibers

机译：旋转玻璃纤维的非线性运动

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摘要

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, Ω_c. 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.
机译：在这里，我们报告了悬浮在水中并经受轻微扭矩的微观，光学捕获玻璃棒的运动。该运动包括两个不同的状态：一个线性状态，其中杆角随时间线性增加；一个非线性状态，其中杆角非线性地变化，经历加速和快速反转。这些状态取决于线性偏振驱动光的旋转频率是高于还是低于临界频率Ω_c。我们将提供涵盖这两种方案的实验数据。我们还将提供与观察到的运动一致的理论模型。我们正在努力将对棒的光学捕获和旋转的努力扩展到较小的尺度，即直径为100 nm或更小。这种缩小将使我们能够研究表面附近的非线性运动。这些研究可以帮助我们了解在微流体和纳米流体中很重要的表面效应。为此，我们报告了捕获陷于丙酮中的直径接近100 nm的银纳米棒的尝试结果。

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