3-d holographic data storage

transcript

TECHNICAL SEMINAR

"3-D HOLOGRAPIC DATA STORAGE"

DEPARTMENT OF ELECTRONICS & COMMUNICATION ENGINEERING

Submitted byS MANJUNATHA CHARIUSN-1CK09EC017

UNDER THE GUIDANCE OFProf.SUJANI.GH O DDEPT. OF ECE, CBIT KOLAR

C.BYREGOWDA INSTITUTE OF TECHNOLOGYT h o r a d e v a n d a H a l l i [ p ] , K o l a r t o S r i n i v a s p u r R o a d , K O L A R – 5 6 3 1 0 1

DEPT OF ECE, CBIT KOLAR 1THANKS TO MY PARENTS AND FRIENDS FOR THEIR SUPPORT.

The Future in Data Storage

DEPT OF ECE, CBIT KOLAR 2

HOLOGRAPHIC DATA STORAGE(3D optical data storage)

1725- Punch Cards

1946-Selectron Tube

1951-Magnetic Tape

1956-Hard Disk

1971-Floppy

1978-Laser Disc

1985-CD ROM

1971 –Compact Cassette

1982- CD

1994- ZIP DRIVE

1995- JAZZ DRIVE & DVD

1998- FLASH DRIVE

2000- SD MEMORY

2006- BLUE RAY DISC

STORAGE

2010-HVD

~ EVOLUTION IN DATA STORAGE ~

~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.

~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.

~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. DEPT OF ECE, CBIT KOLAR 6

~OVERVIEW~DEPT OF ECE, CBIT KOLAR 7

~THE PRACTICAL SETUP~DEPT OF ECE, CBIT KOLAR 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.

~About Lithium Niobate Crystal~

• Chemical Formula- LiNbO3.

• It has high photorefractive sensitivity

& stability.

• It has trigonal structure.

• Molecular weight - 147.9

• Band gap - 4eV

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.

~RECORDING DATA~

DEPT OF ECE, CBIT KOLAR

~READING DATA~DEPT OF ECE, CBIT KOLAR 14

~HOLOGRAPHIC VERSATILE DISK~

• Currently, In phase Technologies is working on HVD.

Capacity : 4 - 6 TerabyteAccess Speed : 10 Gb/secWriting speed: 1 Gb/sec

~ Holographic Versatile Disc structure ~

1.Green writing/reading laser (532 nm)

2.Red positioning/addressing laser (650 nm)

3.Hologram (data)4.Poly-carbon layer5.Photo polymeric layer

(data- containing layer)

6.Distance layers7.Dichroic layer (reflecting

green light)8.Aluminum reflective layer

(reflecting red light)9.Transparent base

~COMPARISION~

~ Capacity, Speed, Cost Comparison ~

~COMPARISION~~COMPARISION~DEPT OF ECE, CBIT KOLAR 22

~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.

~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.

~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.

~CHALLENGES~

• Lasers were costly and unreliable.

SOLUTIONDVD 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.

~ 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.

~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.

Technology has no Limit

Principal: coating a normal DVD with a special light-sensitive protein made from a genetically altered microbe.Storage: 50TBPossibility: 240TB

PROTEIN-COATED DISC

The future is here

Thank you for listening to my presentation!