Volume 86, Number 3, May 2009
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||13 May 2009|
Quantitative assessment of non-conservative radiation forces in an optical trap
Dipartimento di Scienze Fisiche, Università di Napoli “Federico II", Complesso Universitario Monte S. Angelo Via Cintia, 80126 Napoli, Italy, EU
2 ICFO - Institut de Ciencies Fotoniques, Mediterranean Technology Park - 08860, Castelldefels (Barcelona), Spain, EU
3 CNISM, Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Sede di Napoli Napoli, Italy, EU
4 Max-Planck-Institut für Metallforschung - Heisenbergstr. 3, 70569 Stuttgart, Germany, EU
5 2. Physikalisches Institut, Universität Stuttgart - Pfaffenwaldring 57, 70569 Stuttgart, Germany, EU
Corresponding author: firstname.lastname@example.org
Accepted: 14 April 2009
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.
PACS: 87.80.Cc – Biophysical techniques (research methods): Optical trapping / 82.70.Dd – Colloids / 05.40.Jc – Brownian motion
© EPLA, 2009
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