Quantitative assessment of non-conservative radiation forces in an optical trap

Date
2009-05
Editor(s)
Advisor
Supervisor
Co-Advisor
Co-Supervisor
Instructor
Source Title
Europhysics Letters
Print ISSN
Electronic ISSN
1286-4854
Publisher
Institute of Physics Publishing
Volume
86
Issue
3
Pages
1 - 6
Language
English
Journal Title
Journal ISSN
Volume Title
Series
Abstract

The forces acting on an optically trapped particle are usually assumed to be conservative. However, the presence of a non-conservative component has recently been demonstrated. Here, we propose a technique that permits one to quantify the contribution of such a non-conservative component. This is an extension of a standard calibration technique for optical tweezers and, therefore, can easily become a standard test to verify the conservative optical force assumption. Using this technique, we have analyzed optically trapped particles of different size under different trapping conditions. We conclude that the non-conservative effects are effectively negligible and do not affect the standard calibration procedure, unless for extremely low-power trapping, far away from the trapping regimes usually used in experiments.

Course
Other identifiers
Book Title
Keywords
Citation
Published Version (Please cite this version)