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3-d holographic data storage
1. TECHNICAL SEMINAR
"3-D HOLOGRAPIC DATA STORAGE"
DEPARTMENT OF ELECTRONICS & COMMUNICATION ENGINEERING
Submitted by
S MANJUNATHA CHARI
USN-1CK09EC017
UNDER THE GUIDANCE OF
Prof.SUJANI.G
H O D
DEPT. OF ECE, CBIT KOLAR
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THANKS TO MY PARENTS AND FRIENDS FOR THEIR SUPPORT.
4. ~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.
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5. ~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.
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6. ~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.
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10. 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.
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11. ~About Lithium Niobate Crystal~
• Chemical Formula- LiNbO3.
• It has high photorefractive sensitivity & stability.
• It has trigonal structure.
• Molecular weight - 147.9
• Band gap - 4eV
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12. 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 color.
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23. ~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.
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24. ~PERFORMANCE & ADVANTAGES~
• The multi-layer system is optically
transparent and homogeneous .
• Unlike other technologies that record one
data bit 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.
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25. ~CHALLENGES~
• No suitable recording media existed.
SOLUTION:
Tapestry, a high-performance, proprietary
material with proven high-density storage
capabilities, was invented by In Phase
Technologies.
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26. ~CHALLENGES~
• Lasers were costly and unreliable.
SOLUTION
DVD recording technologies require the availability
of high-quality, price-competitive lasers. In Phase
Technologies takes advantage of available red and
blue lasers which are used in other high-volume
products.
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27. ~ STILL EXISTING CHALLENGES~
• 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.
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28. ~CONCLUSION~
• Holographic Data Storage is a convenient ,
effective and secure way of data storage.
• Holographic memory will most likely be
used in next generation super computers
where cost is not as much of an issue.
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31. Principal: coating a normal DVD with a special
light-sensitive protein made from a genetically
altered microbe.
Storage: 50TB
Possibility: 240TB
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