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Optical tweezers of programmable shape with transverse scattering forces

Author:
Alexander Jesacher   Christian Maurer   Severin Fürhapter   Andreas Schwaighofer   Stefan Bernet   Monika Ritsch-Marte  


Journal:
Optics Communications


Issue Date:
2008


Abstract(summary):

We propose a non-holographic method to create line traps of arbitrary shape in the sample plane. Setting the phase gradient along theses lines gives control over the transverse forces acting on the confined particles. Phase structures, displayed on a spatial light modulator, are optically processed by a spiral phase filter and imaged onto the object plane of a microscope objective. The resulting bright line structures can be used to trap microparticles. Additionally, they exert transverse scattering forces, which can be exploited for inducing orbital motions or for creating ldquoattractingrdquo or ldquorepellingrdquo points, respectively. We give theoretical and experimental evidence that these scattering forces are proportional to the curvature of the line tweezers.[All rights reserved Elsevier].


Page:
2207-2212


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