A secure optical storage based on a configuration of a joint transform correlator by use of a photorefractive material is presented. A key code designed through the use of an optimized algorithm so that its Fourier transform has a uniform amplitude distribution and a uniformly random phase distribution is introduced. Original two-dimensional data and the key code are placed side-by-side at the input plane. Both of them are stored in a photorefractive material as a joint power spectrum. The retrieval of the original data can be achieved with the same key code. We can record multiple two-dimensional data in the same crystal by angular multiplexing and/or key code multiplexing.
© 2003 Optical Society of America
(070.1170) Fourier optics and signal processing : Analog optical signal processing
(070.4560) Fourier optics and signal processing : Data processing by optical means
(210.0210) Optical data storage : Optical data storage
(210.2860) Optical data storage : Holographic and volume memories
Takanori Nomura, Shunji Mikan, Yoshiharu Morimoto, and Bahram Javidi, "Secure Optical Data Storage with Random Phase Key Codes by use of a Configuration of a Joint Transform Correlator," Appl. Opt. 42, 1508-1514 (2003)