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Spatioangular-multiplexing scheme for dense holographic storage.

S Tao, Z H Song, D R Selviah

    Applied Optics
    |November 10, 2010
    PubMed
    Summary
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    A new spatioangular multiplexing technique significantly enhances holographic data storage capacity and diffraction efficiency in photorefractive crystals. This method enables storing thousands of patterns in a small crystal volume for advanced associative memory systems.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Computer Science

    Background:

    • Holographic data storage offers high density but faces challenges in capacity and efficiency.
    • Existing multiplexing methods like spatial and angular multiplexing have limitations.

    Purpose of the Study:

    • To introduce and detail a novel spatioangular multiplexing scheme for dense holographic storage.
    • To improve storage capacity and diffraction efficiency compared to existing methods.

    Main Methods:

    • Detailed description of the spatioangular multiplexing technique.
    • Experimental storage of high-resolution patterns in an iron-doped lithium niobate (Fe:LiNbO3) crystal.

    Main Results:

    • Successfully stored 756 high-resolution patterns within a 1 cm³ Fe:LiNbO3 crystal.

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  • Achieved an average diffraction efficiency of 0.5%.

    • Conclusions:

    • Spatioangular multiplexing effectively utilizes storage medium volume, increasing capacity.
    • This method enhances diffraction efficiency by reducing hologram overlap.
    • The developed storage system is suitable for practical associative memory applications.