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Related Experiment Videos

Folded shift multiplexing.

Christophe Moser1, Wenhai Liu, Yeshaiahu Fainman

  • 1Ondax, Inc., 850 East Duarte Road, Monrovia, California 91016, USA. moser@ondax.com

Optics Letters
|June 21, 2003
PubMed
Summary
This summary is machine-generated.

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Shift multiplexing in holographic materials is enhanced using total internal reflection. This method achieves high data storage density, independent of material thickness, by controlling numerical aperture.

Area of Science:

  • Holography
  • Optical Data Storage
  • Materials Science

Background:

  • Shift multiplexing is a holographic data storage technique utilizing spherical reference waves.
  • Extending this to waveguide structures presents opportunities for enhanced storage density.

Purpose of the Study:

  • To adapt shift multiplexing for thin holographic slab waveguides.
  • To investigate the factors influencing shift selectivity in this configuration.

Main Methods:

  • Implementing shift multiplexing within a thin holographic slab acting as a waveguide.
  • Utilizing total internal reflection to fold the spherical reference beam.
  • Analyzing the relationship between shift selectivity, slab thickness, and numerical aperture.

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Main Results:

  • Shift selectivity was found to be independent of slab thickness.
  • Selectivity was dependent on the numerical aperture of the coupled spherical wave.
  • Achieved a shift selectivity of 0.5 micrometers.
  • Successfully recorded 50 high-definition data pages using this method.

Conclusions:

  • The proposed waveguide-based shift multiplexing is effective for high-density holographic data storage.
  • Numerical aperture is a critical parameter for optimizing shift selectivity in such systems.
  • This technique offers a promising approach for future optical storage solutions.