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Two-dimensional finite-difference time-domain simulation for rewritable optical disk surface structure design.

J B Judkins, C W Haggans, R W Ziolkowski

    Applied Optics
    |November 19, 2010
    PubMed
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    A new simulation accurately models focused beam interaction with rewritable optical disks, considering material properties and disk topography. This validated tool aids in designing advanced magneto-optical disk servoformats.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Data Storage Technologies

    Background:

    • Accurate simulation of focused beam interaction with optical disks is crucial for data storage technology advancement.
    • Existing models often simplify material properties or disk topography, limiting their predictive power.
    • Rewritable optical disks require sophisticated modeling due to complex multilayer structures and surface features.

    Purpose of the Study:

    • To develop and validate a novel two-dimensional finite-difference time-domain (2D-FDTD) simulation for focused beam interaction with rewritable optical disks.
    • To incorporate realistic material properties of multilayer stacks and aperiodic disk topography into the simulation.
    • To demonstrate the simulation's utility as a design tool for next-generation optical storage media.

    Main Methods:

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    • A novel 2D-FDTD simulation was developed to model light-disk interactions.
    • The simulation incorporated real material properties of the rewritable multilayer stack.
    • Aperiodic disk topography, including pregrooves and preformat pits, was considered in the model.
    • Simulation results were experimentally validated using magneto-optical disks.

    Main Results:

    • The simulation demonstrated excellent agreement between calculated and measured push-pull tracking servo signals.
    • Validation was performed for magneto-optical disks featuring pregrooves and infinite-length preformat pits.
    • The simulation accurately captured the complex optical behavior of rewritable disk surfaces.

    Conclusions:

    • The developed 2D-FDTD simulation provides a highly accurate method for analyzing focused beam interaction with rewritable optical disks.
    • The simulation serves as a valuable design tool for optimizing optical disk structures and servoformats.
    • This work advances the design capabilities for high-density magneto-optical storage systems.