Monaghan, David S. and Gopinathan, Unnikrishnan and Hennelly, Bryan M. and Kelly, Damien P. and Naughton, Thomas J. and Sheridan, J. T. (2005) Applications of Spatial Light Modulators in Optical Signal Processing Systems. In: Proceedings of SPIE: Opto-Ireland 2005: Photonic Engineering, 358. SPIE Press.

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Abstract

Coherent optical signal processors, due to their ability to process and relay information in two dimensions, have been receiving increasing attention in recent years. These systems involve a coherent field being propagated through some bulk optical system consisting of thin lenses and sections of free space (such paraxial systems being described mathematically using the Linear Canonical Transformation). A Spatial Light Modulator (SLM) may be used to modulate the input digital data onto a coherent wave-field as well as to modulate the amplitude and/or phase of the complex wave-field at any desired plane. The complex field (amplitude and phase) at any desired plane may be recorded quantitatively using a CCD camera, using digital holographic techniques allowing the further processing of data digitally. Such hybrid optoelectronic systems have applications for 2D and 3D data processing covering fields as diverse as data storage, data security and pattern recognition. But devices such as SLMs and CCD cameras can represent only discrete levels of data necessitating a quantisation of continuous valued analog information. In this paper, we take the example of an optical system used to encrypt 2D and 3D data and evaluate the effect of the finite discrete levels of an SLM on the encryption/decryption process. D. S. Monaghana, U. Gopinathana, B. M. Hennellya, D. P. Kellya, T. J. Naughtonb, J. T. Sheridan

Item Type:	Book Section
Additional Information:	This is the postprint version of the published article, which is available at: D. S. Monaghan; U. Gopinathan; B. M. Hennelly; D. P. Kelly; Thomas J. Naughton, et al. "Applications of spatial light modulators in optical signal processing systems", Proc. SPIE 5827, Opto-Ireland 2005: Photonic Engineering, 358 (July 13, 2005); doi:10.1117/12.605003; http://dx.doi.org/10.1117/12.605003
Keywords:	Optical signal processing; Holography; Spatial light modulators; Optical systems; CCD cameras; Data processing; Data storage; Free space; Optoelectronics; Pattern recognition;
Academic Unit:	Faculty of Science and Engineering > Computer Science
Item ID:	8393
Identification Number:	https://doi.org/10.1117/12.605003
Depositing User:	Thomas Naughton
Date Deposited:	03 Jul 2017 15:48
Publisher:	SPIE Press
Refereed:	No
Funders:	Enterprise Ireland, Science Foundation Ireland, Irish Research Council for Science Engineering and Technology (IRCSET)
URI:	http://proceedings.spiedigitallibrary.or...
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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