Open AccessDigital super-resolution holographic data storage based on Hermitian symmetry for achieving high areal density
Author(s) -
Teruyoshi Nobukawa,
Takanori Nomura
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.001326
Subject(s) - holographic data storage , holography , computer data storage , digital holography , optics , computer science , 3d optical data storage , nyquist–shannon sampling theorem , symmetry (geometry) , aperture (computer memory) , physics , computer hardware , computer vision , mathematics , acoustics , geometry
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.