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Assembly of 3-dimensional structures using programmable holographic optical tweezers

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Abstract

The micromanipulation of objects into 3-dimensional geometries within holographic optical tweezers is carried out using modified Gerchberg-Saxton (GS) and direct binary search (DBS) algorithms to produce the hologram designs. The algorithms calculate sequences of phase holograms, which are implemented using a spatial light modulator, to reconfigure the geometries of optical traps in many planes simultaneously. The GS algorithm is able to calculate holograms quickly from the initial, intermediate and final trap positions. In contrast, the DBS algorithm is slower and therefore used to pre-calculate the holograms, which are then displayed in sequence. Assembly of objects in a variety of 3-D configurations is semi-automated, once the traps in their initial positions are loaded.

©2004 Optical Society of America

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Supplementary Material (4)

Media 1: MPG (2280 KB)     
Media 2: MPG (839 KB)     
Media 3: MPG (2259 KB)     
Media 4: MPG (2155 KB)     

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Figures (4)

Fig. 1.
Fig. 1. [2.3MB] Sequence of video frames showing nine 2µm silica spheres morphed to form three triangles with 5µm side lengths stacked in three planes, with 6µm between planes. The times at which each frame was taken is shown in the top corner.
Fig. 2.
Fig. 2. [0.85MB] Sequence of video frames showing twenty-seven 1µm silica spheres initially trapped in three lines of nine spheres and morphed to form three grids of 3 by 3 in three different planes, separated by 8µm. The times at which each frame was taken is shown in the top corner.
Fig. 3.
Fig. 3. [2.6MB] Sequence of video frames showing the morphing of 15µm diamond unit cell made from eighteen 1µm silica spheres. The whole sequence took 5 minutes to complete.
Fig. 4.
Fig. 4. [2.2MB] Sequence of video frames showing the morphing of a 15µm zincblendee unit cell made from fourteen 1µm and four 2µm silica spheres. The whole sequence took 5 minutes to complete.
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