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18 April 2021 "Phase type" orthogonal reference for collinear holography data storage
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Collinear holography data storage (CHDS) is a promising solution for “cold data” storage in the big data age. Studies adopt “amplitude type” and “phase type” orthogonal reference have been sequentially reported for the performance improvement of CHDS. Data from different users can be storage and readout separately by different orthogonal reference, which is meaningful for the application of security data storage. In this paper, a newly “phase type” orthogonal reference specified by a Hadamard orthogonal matrix is proposed for identity information storage. Each one Hadamard vector on behalf of a “phase type” reference, and the symbols “1” and “-1” in Hadamard matrix stands for the phase of 0 and pi of the reference pixel. Several different data pages are recorded using different orthogonal reference in advance, and there is only the specific data page which is matched to the orthogonal reference can be reproduced in the process of reconstruction. The action mechanism of orthogonal reference is analyzed, and the feasibility of the system is verified by numerical simulations and primary experiments.
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Dakui Lin, Xiao Lin, Kun Wang, Yuanying Zhang, Yi Yang, Tianmin Wu, Zhiyun Huang, and Xiaodi Tan ""Phase type" orthogonal reference for collinear holography data storage", Proc. SPIE 11774, Holography: Advances and Modern Trends VII, 1177409 (18 April 2021);

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