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

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      Author(s)
      Pesce, G.
      Volpe, Giovanni
      De Luca, A. C.
      Rusciano, G.
      Volpe, G.
      Date
      2009-05
      Source Title
      Europhysics Letters
      Electronic ISSN
      1286-4854
      Publisher
      Institute of Physics Publishing
      Volume
      86
      Issue
      3
      Pages
      1 - 6
      Language
      English
      Type
      Article
      Item Usage Stats
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      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.
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      http://hdl.handle.net/11693/53562
      Published Version (Please cite this version)
      https://doi.org/10.1209/0295-5075/86/38002
      Collections
      • Advanced Research Laboratories (ARL) 35
      • Department of Physics 2550
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