Liquid crystals in holography

1
Liquid crystals in holography

• Authors
• Lukasz Wilenski, Tomasz Wisniewski, Konrad
  Wyszogrodzki

2
The dynamic holography

• The dynamic holography requires the fully
  reversible, photosensitive material lacking any
  post-processing
• Light can impose molecular reorientation through
  different mechanisms thermal, dye-induced,
  surfaced induced reorientation

3
Set up for recording/optical reconstruction of
digital holograms
4
Technical data

• Laser NdYAG 532nm, 140mV
• CCD Kappa 1300x1080, 4,65µm
• High Speed Spatial Light Modulator LC-R
  1920x1200, 9,5µm
• Frequency of taking holograms 9 frames/second

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Deformation measurements
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Holographic data storage

• The diameter of the magnetic
• domains is limited to around 10 nm
• Holography, an optical 3-D volumetric approach
• In holographic storage, a whole page of
  information in the form of a bit-map is recorded
  at once, instead of storing single bits as in
  digital storage
• several holograms can be recorded in the same
  volume (they can be read by diffrent reference
  beams)

7
Potential use of LC

• material suitable for holographic
• storage should possess
• fast optical switching between two states
• thermal stability over a wide temperature range
• Non-destructive read-out
• It is believed that LC can be usued in such case
  because of their physical properties especially
  the intermediate ordering of molecules between
  order and disorder

8
Properies of the holographic data storage

• potential to store in excess of 1TB
• of information (the CD/DVD disk size)
• Data access time less than 100µs
• transfer rates exceeding 1 GB/s
• Test platform of IBM can store 390bits/µm2