Michael atkinson holographic storage
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Michael atkinson holographic storage

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Michael Atkinson,holographic storage,Michael Atkinson holographic storage

Michael Atkinson,holographic storage,Michael Atkinson holographic storage

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Michael atkinson holographic storage Michael atkinson holographic storage Presentation Transcript

  • Holographic Storage Physics 496 Michael Atkinson
  • 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
  • Outline  Holography Concepts  Refractive index modulation  Storing dataMichael Atkinson 3
  • 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
  • Holography vs Photography  Black and white photograph  Intensity  Color photograph  Intensity and wavelength  Hologram  Intensity, phase, and sometimes wavelengthMichael Atkinson 5
  • Review of InterferenceMichael Atkinson 6
  • Creating HologramMichael Atkinson 7
  • Pattern Left on MediaMichael Atkinson 8
  • Reconstructing the ImageMichael Atkinson 9
  • Qualitative Explanation of StorageReference beam Object image Resultant pattern Stored in film Michael Atkinson 10
  • Qualitative Explanation of ReconstructionReference beam Stored in film Reflection Michael Atkinson 11
  • 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
  • Intensity Threshold EConduction External electric field EValence Object Reference Image Beam Object Reference Image BeamMichael Atkinson 13
  • Storing DataMichael Atkinson 14
  • Reading DataMichael Atkinson 15
  • 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
  • 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
  • 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
  • Questions?Michael Atkinson 19