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Holographic Storage

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. Outline. Holography Concepts Refractive index modulation Storing data.

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Holographic Storage

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  1. Holographic Storage Physics 496 Michael Atkinson

  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 cycles Michael Atkinson

  3. Outline • Holography Concepts • Refractive index modulation • Storing data Michael Atkinson

  4. 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

  5. Holography vs Photography • Black and white photograph • Intensity • Color photograph • Intensity and wavelength • Hologram • Intensity, phase, and sometimes wavelength Michael Atkinson

  6. Review of Interference Michael Atkinson

  7. Creating Hologram Michael Atkinson

  8. Pattern Left on Media Michael Atkinson

  9. Reconstructing the Image Michael Atkinson

  10. Qualitative Explanation of Storage Reference beam Object image Resultant pattern Stored in film Michael Atkinson

  11. Qualitative Explanation of Reconstruction Reflection Reference beam Stored in film Michael Atkinson

  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 effect Michael Atkinson

  13. Intensity Threshold EConduction External electric field EValence Object Image Reference Beam Object Image Reference Beam Michael Atkinson

  14. Storing Data Michael Atkinson

  15. Reading Data Michael Atkinson

  16. Current State of Technology • Storage • CD-ROM: 800 Mbytes – 10 cents • DVD+DL: 8.4 Gbytes - $3 • Blu-Ray DL: 50 Gbyte - $30 • InPhase Tapestry: 300 Gbyte - $250 • Hard disk: 1 Tbyte - $300 • HVD (future): 4 Tbytes • Transfer rates • CD-ROM 52x: ~ 5 Mbit/second • DVD 16x: ~ 20 Mbit/s • InPhase Tapestry: 20 Mbit/sec • Blu-Ray and HDDVD: ~ 30 Mbit/sec • 7200 rpm Hard disk: 80 Mbit/sec Michael Atkinson

  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/2007TapestryProductBrochure.pdf Michael Atkinson

  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.gif Michael Atkinson

  19. Questions? Michael Atkinson

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