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Opt Express. 2011 Oct 24;19(22):21370-84. doi: 10.1364/OE.19.021370.

Positional stability of holographic optical traps.

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  • 1Optical Trapping Lab – Grup de Biofotònica, Departament de Física Aplicada i Òptica, Universitat de Barcelona, Martí i Franquès, 1 08028 Barcelona, Spain.

Abstract

The potential of digital holography for complex manipulation of micron-sized particles with optical tweezers has been clearly demonstrated. By contrast, its use in quantitative experiments has been rather limited, partly due to fluctuations introduced by the spatial light modulator (SLM) that displays the kinoforms. This is an important issue when high temporal or spatial stability is a concern. We have investigated the performance of both an analog-addressed and a digitally-addressed SLM, measuring the phase fluctuations of the modulated beam and evaluating the resulting positional stability of a holographic trap. We show that, despite imparting a more unstable modulation to the wavefront, our digitally-addressed SLM generates optical traps in the sample plane stable enough for most applications. We further show that traps produced by the analog-addressed SLM exhibit a superior pointing stability, better than 1 nm, which is comparable to that of non-holographic tweezers. These results suggest a means to implement precision force measurement experiments with holographic optical tweezers (HOTs).

© 2011 Optical Society of America

PMID:
22108987
[PubMed]
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