Photorefractive moiré like pattern as optical numerical code generator

G. N. de Oliveira; M. E. de Oliveira; P. A. M. dos Santos

doi:10.1117/12.931660

13 September 2012 Photorefractive moiré like pattern as optical numerical code generator

G. N. de Oliveira, M. E. de Oliveira, P. A. M. dos Santos

Proceedings Volume 8493, Interferometry XVI: Techniques and Analysis; 84931F (2012) https://doi.org/10.1117/12.931660
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

In the present letter low frequency moiré fringe patterns are used as secure numerical code generator. These moiré patterns are experimentally obtained by the superposition of two sinusoidal gratings with slightly different pitches. The Bi₁₂TiO₂₀ photorefractive crystal sample is used as holographic medium An optical numerical base was defined with patterns representing 0,1 and -1 digits like bits. Then, the complete set of these optical bits are combined to form bytes, where a numerical sequence is represented. The results show that the proposed numerical code could be used as standard numerical identification in robotic vision or in transmition of security numerical keys.

Citation Download Citation

G. N. de Oliveira, M. E. de Oliveira, and P. A. M. dos Santos "Photorefractive moiré like pattern as optical numerical code generator", Proc. SPIE 8493, Interferometry XVI: Techniques and Analysis, 84931F (13 September 2012); https://doi.org/10.1117/12.931660

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