Measuring and adjusting the trapping position in optical tweezers

Titelangaben

Kress, Holger ; Stelzer, Ernst H. K. ; Rohrbach, Alexander:
Measuring and adjusting the trapping position in optical tweezers.
In: DGaO-Proceedings. (2005) .
ISSN 1614-8436

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Abstract

We show how the trapping position of an optically trapped 1-µm polystyrene bead is measured, and that it can be shifted by changing the relative radiation pressure exerted on the bead. The trapping position of the bead relative to the focus is measured using defocusing microscopy and 2-photon microscopy. Our observations are explained by the two component approach for optical forces.