30 August 2006 Optical security based on three-dimensional phase object
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An optical identification system based a three-dimensional (3D) phase object is presented. The identification is implemented by the correlation between a speckle pattern of the 3D phase object and stored speckle patterns. To achieve a high level of recognition, we use two speckle patterns of the 3D object obtained by illuminating two wavelengths. Experimental and numerical results are presented to show the effectiveness of the proposed system.
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O. Matoba, O. Matoba, T. Sawasaki, T. Sawasaki, K. Nitta, K. Nitta, T. Yoshimura, T. Yoshimura, } "Optical security based on three-dimensional phase object", Proc. SPIE 6311, Optical Information Systems IV, 63110O (30 August 2006); doi: 10.1117/12.680145; https://doi.org/10.1117/12.680145

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