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FIVE DIMENSIONAL OPTICAL

RECORDING ANUPAMA V.C

ROLL NO: 61

REG. NO: CTAHEEC121

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Points on discussion

Introduction on OPTICAL RECORDING

Five Dimensional Optical Recording

Design of Recording medium

Reading and Writing

Fields of Applications

Advantages and Disadvantages

Future scope

Conclusion

Reference

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Literature survey

recording data on a medium through the use of light

photographic film has been widely used as the medium

data is present on the surface of the medium in the

form of bumps and grooves

eg: CD, DVD, Blu ray Disc etc

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Reading logic 0

Reading logic 1

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Five Dimensional Optical

Recording

project carried out by Phd student Mr. Peter Zijlstra of

Swinburne University of Technology in Hawthorn, Australia

Introduced two more dimensions to

existing 3D optical recording

technique

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Dimensions of Data Storage

parameter used to identify each bit ofDATA

Dimensions in 5D optical recording are

3 Spatial Dimensions

ColorDimension

PolarizationDimension

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Design of recording

medium

comes in the shape of a normal DVD, but thickness may vary

a. Gold nanorods in polymer solution coated on thin glass layer

b. Spacer

c. Polycarbonate substrate

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Gold Nanorods

have extraordinary optical and electronic properties

they are spectrum and polarization sensitive

SURFACE PLASMON RESONANCE of Gold nanorods

defines their use in 5D optical recordingSurface Plasmonresonance

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Surface Plasmon resonance (SPR) emerges from the interaction between an electromagnetic

wave and the conduction electrons in a metal

conduction electrons vibrate under the irradiation of light

at a resonant frequency

results in two processes

SCATTERING

ABSORPTION

frequency and bandwidth of the SP resonance depends on the sizeand shape of the nanoparticles

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The above figure shows the far-field images of SPR modes of the same

single gold nano-rod for various incident laser light at red (658nm), green

(532 nm), and blue (488 nm)

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Effect of COLOREDCOLORED Light on Gold Nanorods

SPR of gold nanorods are wavelength depended and also on

size of nanoparticles

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Effect of POLARIZEDPOLARIZED Light on Gold Nanorods

during polarization of light electric field component is restricted

to a particular direction

gold nanorods aligned in the direction of polarisation undergo SPR

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Reading from 5D disc

Reading performed by 2 Photon Luminescence

Reading the bits involves focusing light from the same laser on

the bits but with much lower energy

Nanorods shine as they absorb light with same wavelength and

polarization that changed their shape during recording

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Advantages

Large storage space

Compact and light

Data security

Can be manufactured on a large scale

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Disadvantages

Slow Writing speed

Impracticality of using Titanium Sapphire

Femtosecond Laser

Cost Concerns

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Fields of Application

Medical Field

Military and Security Arenas

Entertainment sector

Space Research

Financial sector

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Conclusion

promising approach for bulk data storage

By introducing color and polarization dimension to existing

technology storage capacity can be increased to 1.6 TB

with new advancement the storage can be increased to 10TB

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