Immersion microscope for static testing of near-field phase-change optical disks

Kenric P. Nelson; Jayant D. Bhawalkar; Timothy J. Frey; John Michael Guerra; Orlando Lopez; Michael F. Ruane

doi:10.1117/12.371160

30 November 1999 Immersion microscope for static testing of near-field phase-change optical disks

Kenric P. Nelson, Jayant D. Bhawalkar, Timothy J. Frey, John Michael Guerra, Orlando Lopez, Michael F. Ruane

Proceedings Volume 3806, Recent Advances in Metrology, Characterization, and Standards for Optical Digital Data Disks; (1999) https://doi.org/10.1117/12.371160
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

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.

Citation Download Citation

Kenric P. Nelson, Jayant D. Bhawalkar, Timothy J. Frey, John Michael Guerra, Orlando Lopez, and Michael F. Ruane "Immersion microscope for static testing of near-field phase-change optical disks", Proc. SPIE 3806, Recent Advances in Metrology, Characterization, and Standards for Optical Digital Data Disks, (30 November 1999); https://doi.org/10.1117/12.371160

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