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    This study introduces modulated chiro-optical orbital angular momentum (OAM) holography for enhanced optical information security. This novel method uses four optical keys for a four-dimensional multiplexing approach, significantly boosting holographic data capacity and safety.

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    Area of Science:

    • Optics
    • Information Security
    • Holography

    Background:

    • Orbital angular momentum (OAM) multiplexing is established in optical information encryption.
    • Existing methods require further enhancement in security capacity.

    Purpose of the Study:

    • To propose modulated chiro-optical OAM (MC-OAM) holography for improved information security.
    • To integrate OAM multiplexing with chiro phase modulation.

    Main Methods:

    • Analysis of orthogonality for axicon parameter, chiro coefficient, and rotation angle.
    • Utilizing these parameters alongside topological charge (TC) as four optical keys.
    • Demonstration of fractional MC-OAM with a minimum TC interval of 0.01.

    Main Results:

    • Demonstrated potential of axicon parameter, chiro coefficient, and rotation angle as extra degrees of freedom.
    • Established a four-dimensional spatial multiplexing method for information security.
    • Experimental and simulation results confirm selectivity and multiplexing properties of MC-OAM holography.

    Conclusions:

    • MC-OAM holography significantly increases holographic information capacity and safety.
    • The proposed method offers a novel approach for secure optical information transmission.
    • Potential for widespread applications in display, information security, and communication.