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Holographic Storage (PowerPoint)

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					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 cycles



Michael Atkinson                                           2
          Outline

                  Holography Concepts



                  Refractive index modulation



                  Storing data

Michael Atkinson                                 3
          Types of Holograms

                  Transmission Hologram
                    Can be used to store data
                    Uses coherent light


                  Reflection Hologram
                    The kind you find on credit cards
                    Uses white light



Michael Atkinson                                         4
          Holography vs Photography

                  Black and white photograph
                      Intensity

                  Color photograph
                      Intensity and wavelength


                  Hologram
                      Intensity, phase, and sometimes wavelength


Michael Atkinson                                              5
          Review of Interference




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          Creating Hologram




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          Pattern Left on Media




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          Reconstructing the Image




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             Qualitative Explanation of
             Storage




Reference beam        Object image   Resultant pattern   Stored in film

   Michael Atkinson                                           10
              Qualitative Explanation of
              Reconstruction




Reference 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
                       effect


Michael Atkinson                                                          12
          Intensity Threshold


         EConduction
                                             External
                                             electric field




         EValence
                       Object    Reference
                       Image     Beam
                        Object   Reference
                        Image    Beam
Michael Atkinson                               13
          Storing Data




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          Reading Data




Michael 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 Tbytes



Michael 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/2007TapestryProductBr
                   ochure.pdf


Michael Atkinson                                                                             17
          Image Sources
                  Slide 2: ad from slashdot.com
                  Slide 6:
                          http://sol.sci.uop.edu/~jfalward/lightinterference/lightwaveshowingelec vector.jpg
                          http://www.chem.wisc.edu/~newtrad/CurrRef/B DGTopic/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.gif




Michael Atkinson                                                                                                               18
                   Questions?




Michael Atkinson                19

				
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