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    Researchers developed a new 1.0NA liquid immersion singlet (LIS) objective lens for two-photon 3D data storage. This innovation enables terabyte (TB) capacity within standard optical disk dimensions.

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    Area of Science:

    • Optical Engineering
    • Data Storage Technologies
    • Materials Science

    Background:

    • Current two-photon 3D optical disks achieve 253GB storage using a 0.5NA lens.
    • Existing systems face limitations in data density and storage capacity within standard form factors.

    Purpose of the Study:

    • To design and implement a novel 1.0NA objective lens for enhanced two-photon 3D data recording.
    • To evaluate the performance of the new lens in achieving higher storage densities and capacities.

    Main Methods:

    • Designed and manufactured a 1.0NA liquid immersion singlet (LIS) objective lens with a long working distance (1.2mm) and small diameter (4.5mm).
    • Integrated the new lens into a single-beam two-photon 3D automated recording system.
    • Conducted experimental recordings to assess bit densities and overall storage capacity.

    Main Results:

    • The 1.0NA LIS objective lens demonstrated significantly improved bit densities compared to the 0.5NA lens.
    • Experimental data indicate the potential for full disk recordings of 0.5 to 1 TB within a 120mm optical disk.
    • A compact optical head utilizing the new objective lens for TB storage was developed.

    Conclusions:

    • The developed 1.0NA LIS objective lens is a key advancement for high-capacity two-photon 3D optical data storage.
    • The system shows promise for achieving terabyte storage in a standard optical disk format.
    • Further development of stable and efficient materials will enhance the viability of this technology.