holographic memory

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holographic memory witch contains 1TB of information

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  • 1. HOLOGRAPHY MEMORY
    BY BHAVITH.D
    5THSEM S.D.M.T.I
    Reg.No:497IS08003
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2. Capacity:4.7Gb
Capacity:700 mb
Capacity:30-50Gb
Capacity:1-4TB
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3. INTRODUCTION
Holography memory is an advancedoptical storage
devicethat can store information in the form of
holographicimage.
It can store up to 1-4 TBof informationina sugar cubesizedcrystal.
Holography data storage is a volumetricapproach of
storing data(use the volume of recording medium).
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4. WHY WE NEED THIS //////??
For Internet applications alone, industry estimates are that storage needs are doubling every 100 days.
By the year 2010, a storage system serving an average LAN will need 100 TB and a WAN server will require 10TB to 1 petabyte of storage.
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5. CONCEPT
Holography the wave field of light(i.e the object and
reference wave) scattered by an object is recorded on a
place (i.e. holographic material) as an interference
pattern.
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6. COMPONENTS
Most holographicstorage systems contain some components basic to the setup.
These are :-
a) Laser Beam
b) Beam Splittersto splitthe Laser Beam
c) Mirrors to direct the Laser Beam
d) A liquid crystal Display panel(SLM)
e) Lenses to focus the Laser Beam
f) RecordingMaterial
g) CCD cameras
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7. Basic Components
spatial light modulator
LCD panel
To direct the laser beams
photopolymer
Lithium-niobate crystal
Mirrors
Beam splitters
CCD camera
To spilt the laser beam
Interprets the digital information
Blue-green argon laser
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8. Holographic Versatile Disc structure
Green writing/reading laser (532 nm)
Red positioning/addressing laser (650 nm)
Hologram (data)
Polycarbonlayer
Photo polymeric layer (data- containing layer)
Distance layers
Dichroic layer (reflecting green light)
Aluminum reflective layer(reflecting red light)
Transparent base
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9. METHOD OF STORING DATA
When the blue-argon laser is focused ,a beam splitter splits it into two beams a reference beam and a signal beam .
Thesignal beam will go straight bounces off one mirror & travel through a SLM.
The signal beam passes through a SLM where digital information, organizedin a page like format of ones and zeroes, is modulatedonto the signal beam as a two dimensional pattern of brightness and darkness .
The information from the page of binary code is carried by the signal beam around to the light sesitive Lithium Niobate crystal.
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10. A second beam called reference beam shoots out the side of the beam splitter and takes a separate path to the crystal.
When the two beams meet, the interference patternthat is created stores the data that is carried by the signal beam on to the surface of the holographic material as a hologram.(Data is stored as a hologram)
Different data pages are recorded over the surface depending on the angle at which the reference beam meets the signal beam
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13. METHOD OF RETRIVING DATA
To retrieve data, the reference beam is focused on the hologram at a particular angle ;this will retrieve the modulated data stored at the same angle of interference .
To read the page ,one need to pass it through detector and then through CCD camera, which will project the data on to the display panel.
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14. In order to retrieve and reconstruct the holographic page of data stored in the crystal, the reference beam is shined into the crystal at exactly the same angle at which it entered to store that page of data.
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16. ADVANTAGES
Large Data Density.
Better Reliability.
Large Capacity.
High Data Transfer Rate.
Fault and Damage Tolerance.
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17. LIMITATIONS AND CHALLENGES
It is very difficult to arrange all of those componentslike CCD camera , SLM arrays and beam steering devices.
Needs good recordings sensitive material to allow highdata transfer rate.
If too many pages are stored in one crystal, the strength of each hologram gets diminished.
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18. APPLICATIONS
A) Petaflop Computing
B) Data Mining
C) Future Computing System
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19. CONCLUSION

The future of holographic memory is very promising. The holographicstorage provide high data density. It can easily store 1000GB of data in a smallcubic centimeter crystal reducing the cost on the other hand. It may offer high
data transfer rate.
But even then the holographic way of storing data is still at the base stage and it may take another couple of years for this technique to hit desktop with a real life data storage solution.
However this technology itself is dazzling and aims to light up the desktop Experienences.
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20. THANK YOU
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