Abstract

A pupil-plane filtering technique is applied to data-signal detection in an optical data-storage system that uses a solid immersion lens (SIL) and a four-layered phase-change recording medium. We have confirmed by numerical calculations and experiment that the technique improves signal contrast and makes the contrast less sensitive to the gap width between the bottom surface of the SIL and the top surface of the recording medium. Light that is incident upon the objective lens that is used with the SIL is linearly polarized, and the full vectorial feature of the light is considered in the calculations.

© 1999 Optical Society of America

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Author Affiliations

Kei Shimura

CI4-Lab, Research and Development Center, Toshiba Corporation, 1 Komukai Toshiba-cho, Saiwai-ku, Kawasaki 210-8582, Japan

Kusato Hirota

Electronic and Imaging Materials Research Laboratories, Toray Industries, Inc., 1-1-1 Sonoyama Otsu, Shiga 520, Japan

Tom D. Milster, Joshua S. Jo

Optical Data Storage Center/Optical Sciences Center, University of Arizona, Tucson, Arizona 85721

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