Holographic%20 Data%20 Storage

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Holographic%20 Data%20 Storage

  1. 1. By: Angel Carrasquillo Michael Huynh Holographic Data Storage
  2. 2. Outline <ul><li>Introduction </li></ul><ul><li>What is Holographic Data Storage? </li></ul><ul><li>How does it work? </li></ul><ul><li>The System </li></ul><ul><li>The Storage Medium </li></ul><ul><li>Recording a Hologram </li></ul><ul><li>Uses of the System </li></ul><ul><li>Pros and Cons </li></ul><ul><li>Experimental Results </li></ul><ul><li>Conclusion </li></ul>
  3. 3. <ul><li>A hologram is a 3D image reproduced form a pattern of interference. </li></ul><ul><li>The Holography technique was invented in 1948 by the Hungarian Dennis Gabor </li></ul><ul><li>This technique have been evolving in the last few years. </li></ul><ul><li>It promises to be the data storing system of the future. </li></ul>Introduction
  4. 4. <ul><li>Storage system in which two beams from the same laser source are used to record data into a recording medium. </li></ul><ul><li>Stores information in the entire volume of the recording medium. </li></ul><ul><li>System that can store up to 1 terabyte of data into a 1 cm 3 recording medium. </li></ul>What is Holographic Data Storage?
  5. 5. How does it work? <ul><li>Two beams come to the crystal and meet at a specific angle. </li></ul><ul><li>The beams create an interference pattern inside the crystal. </li></ul><ul><li>The pattern is recorded inside the crystal. </li></ul>
  6. 6. How does it work? <ul><li>For read-out only the reference beam and the crystal are needed. </li></ul><ul><li>Reference beam should be at the same angle it was when recorded. </li></ul><ul><li>Reference meets with the interference pattern inside the crystal and the signal beam is recreated. </li></ul>
  7. 7. The System <ul><li>Basic components of the System: </li></ul><ul><ul><li>Laser </li></ul></ul><ul><ul><li>Recording Medium </li></ul></ul><ul><ul><li>Mirrors </li></ul></ul><ul><ul><li>Spatial light modulator </li></ul></ul><ul><ul><li>Beam splitter </li></ul></ul><ul><ul><li>Shutters </li></ul></ul><ul><ul><li>Iris </li></ul></ul><ul><ul><li>Lenses </li></ul></ul><ul><ul><li>Half-wave plate </li></ul></ul>
  8. 8. The System <ul><li>Every single component had to be perfectly aligned. </li></ul>
  9. 9. Recording a Hologram <ul><li>Laser beam alignment </li></ul><ul><li>Plane wave obtained through spatial filter and lens. </li></ul><ul><li>Beam splitter. </li></ul><ul><li>Signal beam to SLM </li></ul><ul><li>Reference beam remains a plane wave. </li></ul><ul><li>CCD used for detection of reconstructed hologram. </li></ul>
  10. 10. The Recording Medium <ul><li>Photorefractive and Photopolymer Crystals. </li></ul><ul><li>Media parameters: </li></ul><ul><ul><li>Diffraction efficiency </li></ul></ul><ul><ul><li>Holographic fidelity </li></ul></ul><ul><ul><li>Sensitivity </li></ul></ul><ul><ul><li>Dynamic range </li></ul></ul><ul><ul><li>Volatility. </li></ul></ul>
  11. 11. The Recording Medium <ul><li>Photorefractive Crystal: Lithium Niobate (LiNbO 3 ). Usually doped with elements such as: iron, manganese, or chromium. </li></ul><ul><li>When the crystal is doped, levels are created where electrons reside. </li></ul><ul><li>Interference pattern excites electrons to the Conduction Band. </li></ul><ul><li>Electro-optic effect. </li></ul><ul><li>Refractive index changes. </li></ul>
  12. 12. <ul><li>Can be used to store any kind of information from documents to videos. </li></ul><ul><li>Will be useful for: </li></ul><ul><ul><li>Governments </li></ul></ul><ul><ul><li>Libraries </li></ul></ul><ul><ul><li>Businesses </li></ul></ul><ul><ul><li>People </li></ul></ul>Uses of the System
  13. 13. Pros and Cons <ul><li>Pros: </li></ul><ul><ul><li>Storage capacity </li></ul></ul><ul><ul><ul><li>High Density </li></ul></ul></ul><ul><ul><ul><li>Small Volume </li></ul></ul></ul><ul><ul><li>Effective </li></ul></ul><ul><ul><ul><li>Rapid Data Rate </li></ul></ul></ul><ul><ul><ul><li>Fast Access Times </li></ul></ul></ul><ul><ul><li>Swift searching </li></ul></ul><ul><li>Cons: </li></ul><ul><ul><li>Sensitive </li></ul></ul><ul><ul><li>Material Limitations </li></ul></ul><ul><ul><li>Noise </li></ul></ul><ul><ul><li>Cost </li></ul></ul>
  14. 14. <ul><li>Our setup consisted of: </li></ul><ul><li>-Laser -Iris </li></ul><ul><li>-Half-waveplate -Beam splitter </li></ul><ul><li>-Spatial light modulator -Reflecting mirror </li></ul><ul><li>-Focal lens 90 mm -Power detector </li></ul>The Setup SF Crystal (LiNbO3: Fe ) FL90 Iris λ 2 BS λ 2 Laser DET
  15. 15. Experimental Results
  16. 16. Noise <ul><ul><li>Caused by: </li></ul></ul><ul><ul><li>Temperature </li></ul></ul><ul><ul><li>Loud Sounds </li></ul></ul><ul><ul><li>Movement </li></ul></ul><ul><ul><li>Light </li></ul></ul>
  17. 17. Experimental Results
  18. 18. <ul><li>Holographic Data Storage is a convenient and effective way of data storage. </li></ul>Conclusion
  19. 19. Questions ?

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