16 September 2014 Anomalous dynamic behaviour of optically trapped high aspect ratio nanowires
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Abstract
In the following study we investigate the dynamics of high aspect ratio nanowires held in a single gradient force optical trap in an overdamped environment. Power spectrum analysis performed on the stochastic trajectory of the optically trapped nanowires indicate that the motion of these nanowires shows characteristics of underdamped motion, where a broad resonance peak is present in the power spectrum of amplitude fluctuations under certain conditions. The resonance occurs when the nanowires are trapped at a height of 50 μm from the cover slip of the sample chamber. The emergence of a resonance peak in the power spectrum could be attributed to the non-conservative motion of nanowires being nonspherical, thus creating a bias towards cyclic motion as examined theoretically by Simpson and Hanna [12].
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W. J. Toe, W. J. Toe, I. O. Piwonka, I. O. Piwonka, A. Andres-Arroyo, A. Andres-Arroyo, Q. Gao, Q. Gao, H. H. Tan, H. H. Tan, C. Jagadish, C. Jagadish, B. Henry, B. Henry, C. Angstmann, C. Angstmann, P. J. Reece, P. J. Reece, } "Anomalous dynamic behaviour of optically trapped high aspect ratio nanowires", Proc. SPIE 9164, Optical Trapping and Optical Micromanipulation XI, 91641L (16 September 2014); doi: 10.1117/12.2062673; https://doi.org/10.1117/12.2062673
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