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Related Experiment Videos

Proposal for a multilayer read-only-memory optical disk structure.

Isao Ichimura1, Kimihiro Saito, Takeshi Yamasaki

  • 1Optical System Development Division, Home Electronics Development Group, Sony Corporation Home Electronics Network Company, 6-7-35 Kitashinagawa, Shinagawa-ku, Tokyo 141-0001, Japan. isao.ichimura@jp.sony.com

Applied Optics
|April 1, 2006
PubMed
Summary

For multilayer optical disks, separations over 10 micrometers improve signal quality. This research demonstrates high-density storage up to 200 Gbytes is feasible for read-only memory (ROM) disks.

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Area of Science:

  • Optical data storage
  • Materials science

Background:

  • Multilayer optical disks offer high storage density.
  • Interlayer crosstalk and stray light are challenges in multilayer read-only memory (ROM) disk design.

Purpose of the Study:

  • To investigate coherent interlayer crosstalk and stray-light intensity in multilayer ROM disks.
  • To optimize disk structures and detector selection for improved signal quality and stability.

Main Methods:

  • Scalar diffraction analysis was used to determine optimal layer separation.
  • Quadrilayer and octalayer high-density ROM disks were fabricated using UV-curable films on polycarbonate substrates.
  • Experimental validation of disk performance was conducted.

Main Results:

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  • Layer separations above 10 micrometers are preferred with a 0.85 numerical aperture objective lens for signal quality and focusing control.
  • Disk structures were optimized to minimize signal deterioration from multiple reflections.
  • Data-to-clock jitters below or equal to 7% were achieved.

Conclusions:

  • Optimal layer separation and disk design are crucial for high-density multilayer ROM disks.
  • Feasible storage capacities up to 200 Gbytes are demonstrated.
  • The study provides guidelines for designing advanced optical data storage media.