Michael Atkinson,holographic storage,Michael Atkinson holographic storage

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
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3. Outline
 Holography Concepts
 Refractive index modulation
 Storing data
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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 light
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5. Holography vs Photography
 Black and white photograph
 Intensity
 Color photograph
 Intensity and wavelength
 Hologram
 Intensity, phase, and sometimes wavelength
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6. Review of Interference
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7. Creating Hologram
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8. Pattern Left on Media
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9. Reconstructing the Image
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10. Qualitative Explanation of
Storage
Reference beam Object image Resultant pattern Stored in film
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11. Qualitative Explanation of
Reconstruction
Reference beam Stored in film Reflection
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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
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13. Intensity Threshold
EConduction
External
electric field
EValence
Object Reference
Image Beam
Object Reference
Image Beam
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14. Storing Data
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15. Reading Data
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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 Tbytes
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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/2007TapestryProductBrochur
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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
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19. Questions?
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