Abstract
Holographic data storage is a promising technology that provides very large data storage capacity, and the multiplexing method plays a significant role in increasing this capacity. Various multiplexing methods have been previously researched. In the present study, we propose a shift-peristrophic multiplexing technique that uses spherical reference waves, and experimentally verify that this method efficiently increases the data capacity. In the proposed method, a series of holograms is recorded with shift multiplexing, in which the recording material is rotated with its axis perpendicular to the material’s surface. By iterating this procedure, multiplicity is shown to improve. This method achieves more than 1 Tbits/inch2 data density recording. Furthermore, a capacity increase of several TB per disk is expected by maximizing the recording medium performance.
Highlights
Holographic data storage (HDS) has been researched as a next-generation mass optical storage solution [1,2,3]
We examine the potential of achieving high recording density in the recording and reproduction method by combining peristrophic multiplexing and shift multiplexing with spherical reference waves [21]
We determined the rotational selectivity when numerical aperture (NA) = 0.4 decreased rapidly for peristrophic multiplexing recording, in which spherical reference wave was used the crosstalk rotation angle was 10◦
Summary
Holographic data storage (HDS) has been researched as a next-generation mass optical storage solution [1,2,3]. With HDS, information is recorded as a volume hologram in thick photopolymer media. It can achieve a higher storage capacity than that of conventional planar optical disks. Photopolymer material is preferred [4,5,6] for the following reasons: (1) it is suitable for recording a thick phase-type hologram; (2) it has potential to achieve high diffraction efficiency with. Sci. 2014, 4 low noise, such as scattering; (3) the spectral sensitivity of the medium can be selected with comparative freedom; and (4) deterioration in the hologram does not occur. Issues associated with using photopolymer material, such as recording sensitivity and reliability, have been greatly improved, and this medium is currently expected to become a practical medium for HDS applications
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