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Optical trapping of three-dimensional structures using dynamic holograms

H. Melville, G.F. Milne, G.C. Spalding, W. Sibbett, K. Dholakia, and D. McGloin

Open Access Open Access

Abstract

We demonstrate the use of a spatial light modulator (SLM) to facilitate the trapping of particles in three-dimensional structures through time-sharing. This method allows particles to be held in complex, three-dimensional configurations using cycling of simple holograms. Importantly, we discuss limiting factors inherent in current phase only SLM design for applications in both optical tweezing and atom trapping.

©2003 Optical Society of America

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Figures (5)
Fig. 1.
Fig. 1. A simple optical Tweezer setup including a spatial light modulator for holographic tweezing (beam expansion optics not shown)

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Fig. 2.
Fig. 2. Trapping configurations demonstrated using the Hamamatsu SLM with 2µm silica spheres. (a) two particles trapped in two different planes, the out of focus particle has been lifted above the focal plane of the microscope objective. (b) a triangular pyramid with the out of focus particle again lifted above the others. (c) an inverted pyramid, this time with the central trap site lower than the other particles.

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Fig. 3.
Fig. 3. 2.3µm spheres trapped in three dimensional configurations using the Boulder SLM (a) two planes in a star of david configuration and (b) three particles in three different planes

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Fig. 4.
Fig. 4. Six particles trapped in six separate planes using the Boulder SLM.

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Fig. 5.
Fig. 5. Graphs showing the rise time of the Boulder SLM (grey) and the resultant clipping occurring at 50Hz (black).

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Equations (1)

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Φ z ( ρ ¯ ) = 2 π ρ 2 z λ f 2 mod 2 π
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