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Proceedings Paper

Quantization effects on the deflection angles of digital holograms
Author(s): Andreas G. Georgiou; Jeremy Sosabowski; William A Crossland
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Paper Abstract

Phase holograms can, in principle, route light with zero photon loss. This property makes them ideal for applications with tight power constraints such as free space interconnects and optical tweezers. Both applications require that the deflection angle is varied accurately and smoothly over a certain range. For example, in a free space switch, the output would be a single mode fibre with core diameter of 9μm and the beam has to be centred accurately on it. If an adaptive link is used the beam will be scanned near the output and the optimum position will be determined. Any quantisation effects on the deflection angle may cause instabilities in the feedback loop of the link. In optical tweezers the quantisation effects on the deflection angle will cause the particle to move in discrete steps. This may release the particle from the optical tweezers due to the large acceleration. The quantisation effects on the deflection angle may be difficult to observe because of the very small changes involved. However, these effects can be very important. In this paper we derive the quantisation effects introduced to the deflection angle due to hologram quantisation. We evaluate the minimum number of pixels required in order to achieve a certain resolution on the deflection angle, and finally we suggest methods for enhancing the performance of the hologram by taking into account these effects.

Paper Details

Date Published: 1 September 2004
PDF: 9 pages
Proc. SPIE 5456, Photon Management, (1 September 2004); doi: 10.1117/12.545310
Show Author Affiliations
Andreas G. Georgiou, Univ. of Cambridge (United Kingdom)
Jeremy Sosabowski, Univ. of Cambridge (United Kingdom)
William A Crossland, Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 5456:
Photon Management
Frank Wyrowski, Editor(s)

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