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
Journal Title
Journal ISSN
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
Keywords
Citation
Collections
Source
Physical Review E
Type
Journal article
Book Title
Entity type
Access Statement
Open Access
License Rights
Restricted until
Downloads
File
Description