Nonconservative dynamics of optically trapped high-aspect-ratio nanowires

被引：13

作者：

Toe, Wen Jun ^{[1
]}

Ortega-Piwonka, Ignacio ^{[2
]}

Angstmann, Christopher N. ^{[2
]}

Gao, Qiang ^{[3
]}

Tan, Hark Hoe ^{[3
]}

Jagadish, Chennupati ^{[3
]}

Henry, Bruce I. ^{[2
]}

Reece, Peter J. ^{[1
]}

机构：

[1] Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia

[2] Univ New S Wales, Sch Math & Stat, Sydney, NSW 2052, Australia

[3] Australian Natl Univ, Res Sch Phys & Engn, Canberra, ACT 2601, Australia

来源：

PHYSICAL REVIEW E | 2016年 / 93卷 / 02期

关键词：

TWEEZERS;

D O I：

10.1103/PhysRevE.93.022137

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

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 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.

引用

页数：7

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