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arXiv 1508.03072physics.optics
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光阱高深宽比纳米线的反常动力学行为

Anomalous dynamic behaviour of optically trapped high aspect ratio nanowires

Wen Jun Toe, Ignacio O. Piwonka, Christopher Angstmann, Qiang Gao, Hark Hoe Tan, Chennupati Jagadish, Bruce Henry, Peter J. Reece

摘要:

研究了单梯度力光镊轴向捕获高深宽比纳米线的动力学行为。的布朗动力学的功率谱分析揭示了一个广泛的频谱共振的kHz的顺序与峰值特性,强烈依赖于输入捕获功率。被困纳米线的运动的动力学方程,通过平移和旋转自由度之间的非对称耦合,将非保守效应的建模提供了良好的协议与实验观察。使用缠绕分析对平衡捕获位置周围的持续周期性运动的相关观察为非保守力的影响提供了进一步的证据。

英文摘要:

We investigate the dynamics of high aspect ratio nanowires trapped axially in a single gradient force optical tweezers. A power spectrum analysis of the Brownian dynamics reveals a broad spectral resonance of the order of a kHz with peak properties that are strongly dependent on the input trapping power. Modelling of the dynamical equations of motion of the trapped nanowire that incorporate non-conservative effects through asymmetric coupling between translational and rotational degrees of freedom provides excellent agreement with the experimental observations. An associated observation of persistent cyclical motion around the equilibrium trapping position using winding analysis provides further evidence for the influence of non-conservative forces.

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