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Proceedings Paper

Immersion microscope for static testing of near-field phase-change optical disks
Author(s): Kenric P. Nelson; Jayant D. Bhawalkar; Timothy J. Frey; John Michael Guerra; Orlando Lopez; Michael F. Ruane
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Paper Abstract

A modified optical microscope consisting of an oil immersion objective, index-matching fluid, transducer material, laser diode source, and photomultiplier tube is used to perform static testing of phase-change optical disks designed for use with nearfield optics. A 780-nm wavelength laser beam is coupled to the microscope optical path for read, write, and erase pulsing of the media. The oil immersion objective has a numerical aperture of 1.25. The transducer serves two purposes. The oil is kept off the surface of the disk, and an air gap is formed between the transducer and the surface of the disk. Rewritable phase-change disks with a first surface sensitive layer of GeSbTe were tested with the oil immersion microscope. The relative change in reflectivity due to writing and erasing of amorphous marks between 200 nm and 500 nm in diameter is detected. This technique provides a simple method of investigating the performance of nearfield optical recording media.

Paper Details

Date Published: 30 November 1999
PDF: 10 pages
Proc. SPIE 3806, Recent Advances in Metrology, Characterization, and Standards for Optical Digital Data Disks, (30 November 1999); doi: 10.1117/12.371160
Show Author Affiliations
Kenric P. Nelson, Consultant (United States)
Jayant D. Bhawalkar, Polaroid Corp. (United States)
Timothy J. Frey, Polaroid Corp. (United States)
John Michael Guerra, Polaroid Corp. (United States)
Orlando Lopez, Polaroid Corp. (United States)
Michael F. Ruane, Boston Univ. (United States)

Published in SPIE Proceedings Vol. 3806:
Recent Advances in Metrology, Characterization, and Standards for Optical Digital Data Disks
Fernando Luis Podio, Editor(s)

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