Physics 496 Michael Atkinson

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Presentation transcript:

Physics 496 Michael Atkinson 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

Outline Holography Concepts Refractive index modulation Storing data Michael Atkinson

Types of Holograms Transmission Hologram Reflection Hologram Can be used to store data Uses coherent light Reflection Hologram The kind you find on credit cards Uses white light Michael Atkinson

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

Review of Interference Michael Atkinson

Creating Hologram Michael Atkinson

Pattern Left on Media Michael Atkinson

Reconstructing the Image Michael Atkinson

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

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

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

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

Storing Data Michael Atkinson

Reading Data Michael Atkinson

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

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

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: 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

Questions? Michael Atkinson