3 d optical data storage

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3 d optical data storage

  1. 1. HOLOGRAPHIC DATAHOLOGRAPHIC DATA STORAGESTORAGE (3D optical data storage)(3D optical data storage) Presentation By: SANCHIT GAUTAM The Future in Data Storage
  2. 2. ~INTRODUCTION~~INTRODUCTION~  Hologram is a 3D image reproduced from a pattern of interference.  Several Terabyte level mass storage .  Uses a combination of laser and optical material to achieve this.  3D optical data storage is related to holographic data storage.
  3. 3. ~The Beginning~~The Beginning~ 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.
  4. 4. ~WHY DO WE NEED THIS?~~WHY DO WE NEED THIS?~ To increase data storage capacity by using the space within the crystal that is been used in 1-D and 2-D storage device. Speed retrieval,transfer and search of data. To avoid multiple read/write head complexity.
  5. 5. ~OVERVIEW~~OVERVIEW~
  6. 6. ~THE PRACTICAL SETUP~~THE PRACTICAL SETUP~
  7. 7. What isWhat is SLMSLM ?? 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.
  8. 8. ~About~About Lithium NiobateLithium Niobate Crystal~Crystal~ Chemical Formula- LiNbO3. It has high photorefractive sensitivity & stability. It has trigonal structure. Molecular weight - 147.9. Band gap - 4eV
  9. 9. What isWhat is CCDCCD ?? 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.
  10. 10. ~RECORDING DATA~
  11. 11. ~READING DATA~~READING DATA~
  12. 12. ~HOLOGRAPHIC VERSATILE DISK~~HOLOGRAPHIC VERSATILE DISK~ Currently, Inphase Technologies is working on HVD. Capacity : 6 Terabyte Access Speed : 10 Gb/sec Writing speed: 300 Kb/sec
  13. 13. ~COMPARISION~~COMPARISION~
  14. 14. ~INTERESTING FACTS~~INTERESTING FACTS~ It has been estimated that all the books in the U.S. Library of Congress, could be stored on six (6) HVD's. The pictures of every landmass on Earth (Google Earth for example) can be stored on two (2) HVD's. With MPEG4 ASP encoding, a HVD can hold between 4,600 to 11,900 hours of video, which is enough for non-stop playing for a year.
  15. 15. ~PERFORMANCE & ADVANTAGES~~PERFORMANCE & ADVANTAGES~ The multi-layer system is optically transparent and homogeneous . Unlike other technologies that record one databit at a time, holography allows a million bits data to be written and read in parallel with single flash of light. It allows 1 million bits of data to be written or read in a single flash of light through SLM.
  16. 16. ~CHALLENGES~~CHALLENGES~ Lasers were costly and unreliable. If too many pages are stored in one crystal, the strength of each hologram is diminished.  Align all of the HVD components in a low-cost system.
  17. 17. ~CONCLUSION~~CONCLUSION~ Holographic Data Storage is a convenient , effective and secure way of data storage.
  18. 18. ~REFERENCES~~REFERENCES~ http://en.wikipedia.org/wiki/Holographic_data_storage 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.h http://en.wikipedia.org/wiki/3d Optical Data Storage Bell Laboratories Physical Sciences Research,
  19. 19. Thank you for listening to my presentation! The future is here

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