R&D: Digital Super-Resolution Holographic Data Storage

Optics Express has published an article written by Teruyoshi Nobukawa, Department of Systems Engineering, Wakayama University, 930 Sakaedani, Wakayama 640-8510, Japan, and Research Fellow of the Japan Society for the Promotion of Science, 5-3-1 Kojimachi, Chiyoda, Tokyo 102-0083, Japan, and Takanori Nomura^, Faculty of Systems Engineering, Wakayama University, 930 Sakaedani, Wakayama 640-8510, Japan.

^{Schematic of digital super-resolution holographic data storage}

Abstract: “Digital super-resolution holographic data storage based on Hermitian symmetry is proposed to store digital data in a tiny area of a medium. In general, reducing a recording area with an aperture leads to the improvement in the storage capacity of holographic data storage. Conventional holographic data storage systems however have a limitation in reducing a recording area. This limitation is called a Nyquist size. Unlike the conventional systems, our proposed system can overcome the limitation with the help of a digital holographic technique and digital signal processing. Experimental result shows that the proposed system can record and retrieve a hologram in a smaller area than the Nyquist size on the basis of Hermitian symmetry.”