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Holographic optical data storage jyoti-225

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Transcript

  • 1. The Future in Data Storage Holographic Optical Data Storage
  • 2.
    • Holographic Optical Data Storage (HODS) or Holographic Data Storage System (HDDS)
      • The Revolutionary data storage technology
      • Uses images (holograms) rather than bits to store data
      • Images imposed in material
      • Uses a combination of Lasers & Optical materials to achieve this .
      • This is a Volumetric approach.
    Introduction
  • 3.
    • Pieter J. van Heerden first proposed the idea of holographic (three-dimensional) storage in the early 1960s.
    • A decade later, scientists at RCA Laboratories demonstrated the technology by recording 500 holograms in an iron-doped lithium-niobate crystal .
    • The advent of Semiconductor & magnetic memories stalled its research for much time but it is now picking up momentum.
    The Beginning
  • 4. Why Do We Need This?
    • “ For Internet applications alone, industry estimates are that storage needs are doubling every 100 days”
    • -Nelson Diaz, Lucent Technologies
    • “ Optoelectronics Industry and Technology Development Association projects that by the year 2010, a storage system serving an average LAN will need … 10 TB and a WAN server will require 100 TB to 1 petabyte …of storage”
    • - Red Herring
  • 5. Overview of HODS
  • 6. The Practical Setup
  • 7. The Green Argon Laser
    • Laser light is a green 514.5-nm line of an argon-ion laser.
    • The system is equipped with an argon (514.5-nm) or a krypton (676-nm) laser
    • Optical power delivered to the apparatus prior to the object/reference beam splitter is as much as 100-400 mW .
  • 8. What is SLM ?
    • SLM - Spatial Light Modulator .
    • SLM consists 1-D or 2-D arrays of light modulating elements.
    • SLM converts the digital data 1’s or 0’s into a 2-D array of bright & dark spots.
    • SLM is used to imprint the data on the object beam.
  • 9. About Lithium Niobate Crystal
    • Chemical Formula- LiNbO 3 .
    • It has high photorefractive sensitivity & stability.
    • It has trigonal structure.
    • Molecular weight - 147.9.
    • Band gap - 4eV
  • 10. What is CCD ?
    • CCD - Charge Coupled Device .
    • Its structure was proposed in 1969 by Boyle & Smith.
    • CCD is a light sensitive device.
    • CCD converts pixels in images into electric charge.
    • CCD contains a separate value for each colour.
  • 11. Storage of one bit of information as a Hologram. a) Superposition of spherical wave from one bit with a coherent plane wave reference beam forming an interference pattern. b) Exposure of a photosensitive medium to the interference pattern. c) Record of the interference grating, stored as changes in the properties of the medium. Storage inside the Photosensitive Medium
  • 12. Recording
    • Data stream is sent to the SLM as 0’s and
    • 1’s.
      • Forms a “checkerboard” pattern
        • 1’s transmit light, 0’s block light
    • Beam is split
      • Light passing through SLM is the signal (object) beam
      • Reflected beam is the reference beam
    • Beams interfere in the medium to produce hologram much like before
  • 13. Recording by Figure
  • 14. Reading
    • Beam no longer split
    • Reference beam is diffracted off the recorded grating (hologram)
      • Reconstructs matrix
    • Projected using optic onto CCD
      • Converts into data stream
  • 15. Reading by Figure
  • 16. Impacts
    • The everyday user might not notice the impact other than more space on his/her computer.
    • Big benefactors are big business and internet
      • Parallel data storage and retrieval allows for very fast data excess for number crunching and experiments (much faster computation times).
      • Much faster data access for internet servers as well as much larger storage densities.
      • Cheaper cost per Megabyte once mainstream.
    • Data storage for libraries, documents and so forth will be cheaper and take up less space and access will be much faster.
  • 17. Future Applications
    • Imagine the capability of 6,840 raw uncompressed high quality Video/TV hours, or 2,100,000 chest x-rays, or nearly 10,000,000 high-resolution images, or 30,000 four-drawer filing cabinets of documents or 20,000 DVD'S Worm's or 4,000 BLU-Ray Worm disk's on ONE 10 Terabyte 3.5 in. removable disc.
  • 18. Future Applications
  • 19. Long Term !
    • Eventually HODS’s may take over magnetic and optical devices all together
      • DVD’s with 10 terabytes on them !
      • Less need for compression techniques (depending on internet communications)
      • Even smaller computers (hard drive one of the largest components)
      • Less power to drive = longer lasting laptops
  • 20. Market Prospects
    • Current storage memory market exceeds $100 billion dollars worldwide
      • $47 billion is solely hard disk, $42 billion magnetic tape drives, $6 billion optical disk
    • This is growing at 40% a year (1998)
    • HODS has the possibility of taking over this entire market
      • Can assimilate all these data storage types
      • Little to no competitive alternatives on the horizon
  • 21. Who is Involved…
    • InPhase Technologies , venture of Lucent Technologies
      • Exclusive purpose is to develop high-performance holographic data storage media
      • Seem to be leaders in viable product, near useable solution
    • Government and other participants donate $32 million for research
      • Large majority of research focused at Standford and IBM ’s Almaden Research Facility
  • 22. Interesting Facts
    • With predicted technology a 1cm 3 laser cube is equal to :
    • - 6,944,440 1.44MB floppy discs
    • - 14,286 700 MB CD-ROM’s
    • 40 250 GB hard drives
    • 25 million books of the Library of Congress(US)
  • 23. Conclusion
    • Built on technology that’s around for 40+ years
    • HODS may be the future of data storage
      • HUGE capacity, Very fast, Smaller
      • Parallel processing
    • Current storage methods nearing their fundamental limits of storage density
    • Stationary parts for some techniques
    • Meets the demand for a capacity hungry society
    • Large market and little new competition
  • 24. Further Research/Bibliography
    • www.lucent.com/press/0101/010130.bla.html
    • http://www.research.ibm.com/research/press/holographic.html
    • http://www.research.ibm.com/journal/rd/443/ashley.pdf
    • http://www.imation.com/about/news/newsitem/0%2C1233%2C298%2C00.html
    • http://www.pitt.edu/~drew1/2089/holo.htm
    • http://www.sciam.com/2000/0500issue/0500toigbox5.html
  • 25. Thank you for listening to my presentation! The future is here