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Proceedings Paper

Anomalous dynamic behaviour of optically trapped high aspect ratio nanowires
Author(s): W. J. Toe; I. O. Piwonka; A. Andres-Arroyo; Q. Gao; H. H. Tan; C. Jagadish; B. Henry; C. Angstmann; P. J. Reece
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Paper 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].

Paper Details

Date Published: 16 September 2014
PDF: 6 pages
Proc. SPIE 9164, Optical Trapping and Optical Micromanipulation XI, 91641L (16 September 2014); doi: 10.1117/12.2062673
Show Author Affiliations
W. J. Toe, The Univ. of New South Wales (Australia)
I. O. Piwonka, The Univ. of New South Wales (Australia)
A. Andres-Arroyo, The Univ. of New South Wales (Australia)
Q. Gao, The Australian National Univ. (Australia)
H. H. Tan, The Australian National Univ. (Australia)
C. Jagadish, The Australian National Univ. (Australia)
B. Henry, The Univ. of New South Wales (Australia)
C. Angstmann, The Univ. of New South Wales (Australia)
P. J. Reece, The Univ. of New South Wales (Australia)

Published in SPIE Proceedings Vol. 9164:
Optical Trapping and Optical Micromanipulation XI
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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