Nonconservative dynamics of optically trapped high-aspect-ratio nanowires

Date

2016

Authors

Toe, Wen Jun
Ortega-Piwonka, Ignacio
Angstmann, Christopher N.
Gao, Qian
Tan, Hark Hoe
Jagadish, Chennupati
Henry, B I
Reece, Peter

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Volume Title

Publisher

American Physical Society

Abstract

We investigate the dynamics of high-aspect-ratio nanowires trapped axially in a single gradient force optical tweezers. A power spectrum analysis of the dynamics reveals a broad spectral resonance of the order of kHz with peak properties that are strongly dependent on the input trapping power. A dynamical model incorporating linear restoring optical forces, a nonconservative asymmetric coupling between translational and rotational degrees of freedom, viscous drag, and white noise provides an excellent fit to experimental observations. A persistent low-frequency cyclical motion around the equilibrium trapping position, with a frequency distinct from the spectral resonance, is observed from the time series data.

Description

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Citation

Source

Physical Review E

Type

Journal article

Book Title

Entity type

Access Statement

Open Access

License Rights

DOI

10.1103/PhysRevE.93.022137

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