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Michael atkinson holographic storage

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Michael atkinson holographic storage

  1. 1. Holographic Storage Physics 496 Michael Atkinson
  2. 2. Why Holographic Storage?  Storage Density  media stores data in whole volume  Speed  parses many bits at once  Reliability  Good shelf life  High number of write cyclesMichael Atkinson 2
  3. 3. Outline  Holography Concepts  Refractive index modulation  Storing dataMichael Atkinson 3
  4. 4. Types of Holograms  Transmission Hologram  Can be used to store data  Uses coherent light  Reflection Hologram  Thekind you find on credit cards  Uses white lightMichael Atkinson 4
  5. 5. Holography vs Photography  Black and white photograph  Intensity  Color photograph  Intensity and wavelength  Hologram  Intensity, phase, and sometimes wavelengthMichael Atkinson 5
  6. 6. Review of InterferenceMichael Atkinson 6
  7. 7. Creating HologramMichael Atkinson 7
  8. 8. Pattern Left on MediaMichael Atkinson 8
  9. 9. Reconstructing the ImageMichael Atkinson 9
  10. 10. Qualitative Explanation of StorageReference beam Object image Resultant pattern Stored in film Michael Atkinson 10
  11. 11. Qualitative Explanation of ReconstructionReference beam Stored in film Reflection Michael Atkinson 11
  12. 12. Photorefractive effect  Electrons gain energy from light  Leave Valence band, can move freely  Diffuse toward dark areas  When beams removed, electrons settle and we have internal net electric fields  Index of refraction changed due to electro-optic effectMichael Atkinson 12
  13. 13. Intensity Threshold EConduction External electric field EValence Object Reference Image Beam Object Reference Image BeamMichael Atkinson 13
  14. 14. Storing DataMichael Atkinson 14
  15. 15. Reading DataMichael Atkinson 15
  16. 16. Current State of Technology  Storage  Transfer rates  CD-ROM: 800 Mbytes – 10 cents  CD-ROM 52x: ~ 5 Mbit/second  DVD+DL: 8.4 Gbytes - $3  DVD 16x: ~ 20 Mbit/s  Blu-Ray DL: 50 Gbyte - $30  InPhase Tapestry: 20 Mbit/sec  InPhase Tapestry: 300 Gbyte - $250  Blu-Ray and HDDVD: ~ 30 Mbit/sec  Hard disk: 1 Tbyte - $300  7200 rpm Hard disk: 80 Mbit/sec  HVD (future): 4 TbytesMichael Atkinson 16
  17. 17. References  Physics for Scientists and Engineers with Modern Physics – Vol 2, Serway and Jewett  International Conference on Holography, Optical Recording, and Processing of Information: http://spiedl.aip.org/dbt/dbt.jsp?KEY=PSISDG&Volume=6252&Issue=1  Thermally sensitized optical recording in azobenzene polymers • D.Illieva, M. Ivanon, T. Petrova, V. Dragostinova, G. Minchev, T. Todorov, L. Nikolova  Refractive data of optical plastics for laser applications • N. Sultanova, S. Kasarova, C. Ivanov, I. Nikolov  Pulse Recording Dynamics of Diffraction Gratings in Xanthene Dyes Sensitized Photopolymer Material • E. Vasilyev, V. Shelkovnikov, E. Pen, A. Plechanov  Holographic recording in nanoparticle-doped photopolymer • I. Naydenov, H. Sheriff, S. Mintova, S. Toala  http://hyperphysics.phy-astr.gsu.edu/hbase/optmod/holcon.html  http://www.research.ibm.com/journal/rd/443/ashley.html  http://www.howstuffworks.com/holographic-memory.htm  http://en.wikipedia.org/wiki/Holography  http://en.wikipedia.org/wiki/Holographic_Versatile_Disc  http://www.inphasetechnologies.com/downloads/pdf/products/2007TapestryProductBrochurMichael Atkinson 17
  18. 18. Image Sources  Slide 2: ad from slashdot.com  Slide 6:  http://sol.sci.uop.edu/~jfalward/lightinterference/lightwaveshowingelecvector.jpg  http://www.chem.wisc.edu/~newtrad/CurrRef/BDGTopic/BDGFigs/3_13cdfere.gif  Slide 7:  http://hyperphysics.phy-astr.gsu.edu/hbase/optmod/imgopm/holo2.gif  Slide 8:  http://hyperphysics.phy-astr.gsu.edu/hbase/optmod/modpic/holripp.jpg  Slide 9:  http://hyperphysics.phy-astr.gsu.edu/hbase/optmod/imgopm/holo3.gif  http://www.research.ibm.com/journal/rd/443/ashle2.gif  Slide 10:  drawn by me  Slide 11:  drawn by me  Slide 13:  taken from Thermally sensitized optical recording in azobenzene polymers, D.Illieva, M. Ivanon, T. Petrova, V. Dragostinova, G. Minchev, T. Todorov, L. Nikolova  Slide 14:  http://static.howstuffworks.com/gif/holo-memory.gif  Slide 15:  http://static.howstuffworks.com/gif/holo-memory2.gif  Slide 16:  http://www.inphase-technologies.com/images/products/drive-media_lg.jpg  Slide 19:  http://physicsweb.org/objects/world/13/7/7/pw-13-07-07fig4.gifMichael Atkinson 18
  19. 19. Questions?Michael Atkinson 19

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