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Shift multiplexing with a spherical wave in holographic data storage based on a computer-generated hologram.

Teruyoshi Nobukawa, Takanori Nomura

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    |May 3, 2017
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    This study introduces a novel shift multiplexing method for computer-generated hologram (CGH) holographic data storage. The technique enhances recording density by using a spherical wave for improved shift selectivity.

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    Area of Science:

    • Optics and Photonics
    • Data Storage Technologies
    • Information Science

    Background:

    • Holographic data storage offers compact and simple systems using computer-generated holograms (CGH).
    • Existing CGH systems lack additional optical paths for reference beams, limiting recording density.
    • Improving recording density is crucial for advancing holographic data storage.

    Purpose of the Study:

    • To propose a novel shift multiplexing method for CGH-based holographic data storage.
    • To enhance the recording density of holographic data storage systems.
    • To improve shift selectivity in holographic data storage.

    Main Methods:

    • A shift multiplexing method utilizing a spherical wave is proposed for CGH holographic data storage.
    • Simultaneous reconstruction of a data page and a spherical wave from a single CGH.
    • Shift multiplexing is achieved by displacing the recording medium.

    Main Results:

    • The proposed method successfully improves shift selectivity in holographic data storage.
    • Experimental results demonstrate the feasibility of implementing shift multiplexing.
    • The technique allows for enhanced recording density in CGH-based systems.

    Conclusions:

    • The novel shift multiplexing method effectively enhances recording density in CGH holographic data storage.
    • The use of a spherical wave improves shift selectivity, enabling practical implementation.
    • This advancement contributes to the development of more efficient holographic data storage solutions.