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Read/write performance and reliability of a flying optical head using a monolithically integrated LD-PD.

H Ukita, Y Sugiyama, H Nakada

    Applied Optics
    |August 14, 2010
    PubMed
    Summary
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    A novel flying head with an integrated laser diode-photodetector (LD-PD) demonstrates superior data read/write capabilities. This optical head offers excellent performance and durability for advanced data storage applications.

    Area of Science:

    • Optoelectronics
    • Data Storage Technology
    • Materials Science

    Background:

    • Traditional hard drive read/write heads face limitations in speed and density.
    • Optical switching offers potential for higher performance data storage.
    • Integration of laser diodes and photodetectors is key for advanced optical systems.

    Purpose of the Study:

    • To develop and evaluate a novel flying head utilizing an optically switched laser diode for enhanced read/write performance.
    • To assess the head-disk interface characteristics and long-term stability of the new optical head design.

    Main Methods:

    • Fabrication of a flying head comprising an aluminum nitride slider and a monolithically integrated InGaAsP laser diode-photodetector (LD-PD).
    • Incorporation of a ridged waveguide on the laser diode facet to focus the light beam.

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  • Testing of the head's read/write performance on a disk with a SiN protective layer over a SbTeGe phase-change recording medium.

    • Main Results:

    • The optical flying head achieved excellent read/write performance and head-disk interface.
    • Minimum writing power was 18 mW at 1 MHz and a medium velocity of 7 m/s.
    • The head maintained a good signal after over 50,000 contact start/stop cycles and 440 million passes.

    Conclusions:

    • The optically switched laser diode flying head offers a promising solution for high-performance data storage.
    • The integrated LD-PD design and optical focusing mechanism contribute to excellent read/write efficiency.
    • The demonstrated durability suggests suitability for demanding data storage applications.