holographic memory

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By Sayandeb Banerjee (13000311075) Shiladitya Bandopadhyay (13000311077) Siddhartha Chattaraj (13000311082) Soumya Deep Das (13000311089) Mentor Prof. Amiya Kumar Sarkar

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A presentation on the physics and working of Holographic memory and HVDs.

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Page 1: Holographic Memory

BySayandeb Banerjee

(13000311075)Shiladitya Bandopadhyay

(13000311077)

Siddhartha Chattaraj(13000311082)

Soumya Deep Das(13000311089)

Mentor

Prof. Amiya Kumar Sarkar

Page 2: Holographic Memory

Table of Contents

• A Glance at History

•What is a Hologram?

•What is Holographic Memory?

•Working Principle

•HVD

•HVD Disc Structure

• Collinear Holography – Writing Data

• Collinear Holography – Reading Data

•HVD vs. Other Optical Discs

Page 3: Holographic Memory

A Glance at History

The Drive for More Memory!1928

Magnetic Tape

1956Hard Disk

1971Floppy Drive

1980CD

1994Flash

1995DVD

2003Bluray

HVD

Page 4: Holographic Memory

LASER

OBJECT

BEAM SPLITTER

MIRROR

PHOTOGRAPHIC PLA

TEDIFFUSION LENSES

Refere

nce

beam

Signal beam

“A three-dimensional image formed by the interference of light beams from a laser or other coherent light source.”

Page 5: Holographic Memory

• A mass storage technology that uses three-dimensional holographic images to enable more information to be stored in a much smaller space.

• A potential technology in the area of high-capacity data storage currently dominated by magnetic and conventional optical data storage.”

Page 6: Holographic Memory

10100110011100010110101010101010101010100101010101001010101000110011010111111011011111010101010010010101101010

Working Principle

SLM

COVER LAYER

RECORDING LAYER

REFLECTIVE LAYER

OBJECTIVE LENS

Deffracted Information

beam (page data)

Deffracted Reference

beam (modulated)

Page 7: Holographic Memory

HVD

An optical disc technology developed between April 2004 and mid-2008 that can store up to several terabytes of data on an optical disc 10 cm or 12 cm in diameter.

Prototypes

developed with

up to 3.9Tb

capacit

yData

transf

er

rate

up to

1Gbps

Page 8: Holographic Memory

HVD Disc Structure

Gap Layer

PitBase Layer

Aluminium reflective Layer

Dichroic Mirror Layer

Recording Layer(photo polymer)

Cover Layer

Hologram

Red LightGreen or Blue Light

Page 9: Holographic Memory

10100110011100010110101010101010101010100101010101001010

Data

Data Pages

SLM

Laser

Recording Medium

Reference Beam

Signal Beam

Relay Optics

Writing Data

Page 10: Holographic Memory

Recording Medium

Reference Beam

Relay Optics

ImageOptics

Detector

10100110011100010110101010101010101010100101010101001010

Laser Recovered Data

Reading Data

Page 11: Holographic Memory

DVD DVD Blu-ray Blu-ray HVD

Number of Layers Single Dual Single Dual 200 +/-

Recording Capacity 4.7BG 9.4GB 25GB 50GB 3.9TB

Data Transfer Rate 11.08MB/s

11.08MB/s

36MB/s 36MB/s 1GB/s

IBM's test platforms can store up to 390 bits per square micron. DVDs, by contrast, have a storage density of about five bits per square micron.

HVD vs. Other Optical Discs

Storage & Speed

Page 12: Holographic Memory

HVD vs. Other Optical DiscsTechnology

Data is burnt 1 bit at a time

Thin surface recording

substrate~1mm

Serial data1bit/pulse

Volumetric recording

Page data is recorded in the volumetric Recording layer

Page data through SLM60,000 bits/pulse

200 – 300bits/ mm

Conventional Optical Disc Holographic Optical Disc

Page 13: Holographic Memory

HVD vs. Other Optical Discs

Life Expectancy

HVD’s have an estimated archival life expectancy of at least 50 years or more compared to CD/DVD archival life of 2 to 5 years (even though published life expectancies are often cited as 10 to 25 years or longer for optical media, it depends on the storage conditions and quality of the disks).

Page 14: Holographic Memory
Page 15: Holographic Memory

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