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    Near-field combination apertures for ultra-resolution optical storage

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    Author
    Tang, Shu-Guo
    Issue Date
    2002
    Keywords
    Physics, Optics.
    Advisor
    Milster, Tom D.
    
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    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    This dissertation proposes and demonstrates an innovative technique for ultra-resolution data storage. An original idea that combines two near-field techniques, aperture probes and the solid immersion lens (SIL), is implemented through modeling, fabrication, testing, phase-change recording, and writing condition studies. In the modeling, a theory for illumination and signal detection is presented. The power transmission for different near-field transducers illuminated by a lens is calculated versus NA. In detection, the angular spectrum illustrates advantages of the combination aperture system. In addition, geometrical design considerations are discussed with the modeling. Nearly optimal designs for APSIL and Al aperture + SIL are presented for the illumination wavelength 488 rim. Fabrication techniques are developed for dielectric aperture + SIL, which is called APSIL, and Al aperture + SIL, respectively through modeling geometrical design. Both near-field transducers are tested by edge-scan experiments. Spot size and optical efficiency from the APSIL system are evaluated. APSIL is evaluated for high-density recording on a phase-change medium. Minimum mark size and the modulation transfer function (MTF) are obtained experimentally. Control of writing conditions for an APSIL system are investigated with respect to polarization, axial focus position and transverse beam alignment. Our study shows that the APSIL system achieves much higher optical efficiency than aperture probe systems as well as exhibits better resolution than SIL systems.
    Type
    text
    Dissertation-Reproduction (electronic)
    Degree Name
    Ph.D.
    Degree Level
    doctoral
    Degree Program
    Graduate College
    Optical Sciences
    Degree Grantor
    University of Arizona
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