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    This study introduces binary computer-generated holograms (CGH) for holographic data storage (HDS) using binary spatial light modulators (SLMs). A novel low-pass filtering method improves reconstructed image quality for faster data transfer rates.

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    Area of Science:

    • Optics
    • Data Storage
    • Holography

    Background:

    • Conventional computer-generated-hologram-based holographic data storage (CGH-HDS) typically requires multilevel spatial light modulators (SLMs). Binary SLMs offer higher refresh rates, crucial for increasing data transfer rates in HDS.
    • Using binary CGH with binary SLMs can degrade reconstructed image quality and emphasize high spatial frequencies, posing challenges for data retrieval.

    Purpose of the Study:

    • To propose and validate a method for enhancing holographic data storage (HDS) using binary computer-generated holograms (CGH) and binary spatial light modulators (SLMs).
    • To improve the data transfer rate of HDS by leveraging the higher refresh rates of binary SLMs while maintaining acceptable reconstructed image quality.

    Main Methods:

    • Introduction of binary CGH for HDS to utilize faster binary SLMs.
    • Implementation of low-pass filtering with an aperture at the recording medium plane to improve reconstructed intensity distributions.
    • Numerical evaluation of the optimal aperture size for the low-pass filter.
    • Experimental verification of the proposed method.

    Main Results:

    • The proposed low-pass filtering method successfully obtains reconstructed intensity distributions with satisfactory image quality for datapages.
    • The optimum aperture size for effective low-pass filtering was numerically determined.
    • The method was experimentally validated, demonstrating its practical feasibility.
    • Single and multiplexed recording of three datapages was achieved using a spherical reference beam with a binary CGH.

    Conclusions:

    • Binary CGH combined with low-pass filtering offers a viable approach to enhance holographic data storage (HDS) performance.
    • This method enables the use of high-speed binary SLMs, leading to increased data transfer rates in CGH-HDS systems.
    • The technique effectively addresses the image quality degradation typically associated with binary CGH, allowing for reliable data storage and retrieval.