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Proceedings Paper

Verification of tracking servo signal simulation from scanning tunneling microscope surface profiles
Author(s): Thomas E. Karis; Margaret E. Best; Anthony Logan; James R. Lyerla; Robert T. Lynch; R. P. McCormack
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Paper Abstract

Well-defined track crossing signals are essential for the laser tracking servo systems to follow radial runout. We developed an approach to verify Fourier Optics calculation of the track crossing signals from 3D surface profiles measured by Scanning Tunneling Microscopy (STM) and also by measuring the actual tracking servo groove signals from the substrate on an optical disk tester. Nearly quantitative agreement between the tracking signals calculated from the measured STM profiles and those measured by the optical disk tester was demonstrated on grooved glass disk substrates with a 1.6 micrometers pitch and nominal groove depths of 20, 40, and 70 nm, and on photopolymer on glass substrates with track pitches of 1.6, 1.4, 1.2, 1.0, 0.8 and 0.6 micrometers and a groove depth of 67 nm. Injection molded polycarbonate substrates made with high and low mold temperature showed poor replication at the lower mold temperature. The servo signals reflected the degraded servo groove performance due to the poor servo groove replication at the lower mold temperature.

Paper Details

Date Published: 1 July 1991
PDF: 11 pages
Proc. SPIE 1499, Optical Data Storage '91, (1 July 1991); doi: 10.1117/12.45924
Show Author Affiliations
Thomas E. Karis, IBM/Almaden Research Ctr. (United States)
Margaret E. Best, IBM/Almaden Research Ctr. (United States)
Anthony Logan, IBM/Almaden Research Ctr. (United States)
James R. Lyerla, IBM/Almaden Research Ctr. (United States)
Robert T. Lynch, IBM/Almaden Research Ctr. (United States)
R. P. McCormack, IBM/Almaden Research Ctr. (United States)


Published in SPIE Proceedings Vol. 1499:
Optical Data Storage '91

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