Jpn. J. Appl. Phys. 38 (1999) pp. 1793-1794 |Next Article| |Table of Contents|
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The Nature of the Coupling Field in Optical Data Storage Using Solid Immersion Lenses
1Optical Data Storage Center/Optical Sciences Center
University of Arizona, Tucson, Arizona 85721, USA
2 Electronic and Imaging Materials Research Laboratories
Toray Industries, Inc., 1-1-1 Sonoyama, Otsu 520, Japan
3 CI4, Research and Development Center, Toshiba Corporation.
1, Komukai Toshiba-cho, Saiwai-ku, Kawasaki 210-8582, Japan
(Received November 16, 1998; accepted for publication November 25, 1998)
The field incident onto the interface between the solid immersion lens (SIL) and recording medium
is decomposed into two parts that exhibit different behavior as the beam propagates through the
recording layers. The homogeneous part is shown to diffract, and the inhomogeneous part decays
exponentially away from the bottom of the SIL. Reflection and signal contrast are calculated for a
phase-change recording medium. The dependences of the signal contrast on the gap width, the
refractive index of gap and the SIL are analyzed.
KEYWORDS:near field optics, vector diffraction, evanescent energy, polarization,
solid immersion lens, optical data storage
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