FIVE DIMENSIONAL OPTICAL

RECORDING

INDEX• 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

INTRODUCTION ONOPTICAL RECORDING

• 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 theform of bumps and grooves

• eg: CD, DVD, Blu ray Disc etc

Reading logic ‘0’

Reading logic ‘1’

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 toexisting 3D optical recordingtechnique

Dimensions of Data Storage

• parameter used to identify each bit of DATA

• Dimensions in 5D optical recording are

3 Spatial Dimensions

Color Dimension

Polarization Dimension

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

Gold Nanorods• have extraordinary optical and electronic properties

• they are spectrum and polarization sensitive

• SURFACE PLASMON RESONANCE of Gold nanorodsdefines their use in 5D optical recording

SPR• emerges from the interaction between an electromagneticwave and the conduction electrons in a metal

• conduction electrons vibrate under the irradiation of lightat a resonant frequency

• results in two processes SCATTERING ABSORPTION

• frequency and bandwidth of the SP resonance depends on the size and shape of the nanoparticles

The above figure shows the far-field images of SPR modes of thesame single gold nano-rod for various incident laser light at red(658nm), green (532 nm), and blue (488 nm)

Effect of COLOREDCOLORED Light on Gold Nanorods

• SPR of gold nanorods are wavelength depended and also onsize of nanoparticles

Effect of POLARIZEDPOLARIZED Light on Gold Nanorods

• during polarization of light electric field component is restrictedto a particular direction

• gold nanorods aligned in the direction of polarisation undergo SPR

Writing

• tunable laser is used : Titanium Sapphire Femtosecond Laser

• Light impinging with a certain color and polarization will only target a subpopulation of gold nanorods, leaving the remaining rods forthe next recording

• nanorods change shape when written and retains the shape thereafter

Reading

•Reading performed by 2 Photon Luminescence

•Reading the bits involves focusing light from the same laser onthe bits but with much lower energy

• Nanorods shine as they absorb light with same wavelength andpolarization that changed their shape during recording

Fields of Application

• Medical Field

• Military and Security Arenas

• Entertainment sector

• Space Research

• Financial sector

Advantages

• Large storage space

• Compact and light

• Data security

• Can be manufactured on a large scale

Concerns

• Slow Writing speed

• Impracticality of using Titanium Sapphire Femtosecond Laser

• Cost Concerns

Future Scope

• SAMSUNG has taken the rights of developing the drive

• Available in the market within 5 years

• Can increase the capacity to 10 TB

• Development much cheaper nanoparticles

Conclusion

• promising approach for bulk data storage

• By introducing color and polarization dimension to existingtechnology storage capacity can be increased to 1.6 TB

• with new advancement the storage can be increased to 10TB

Reference[1] Nanophotonics Down Under 2009 Devices and Applications ,

www.swinburne.edu.au

[2] Nano-particle Based Multi-Dimensional Data Storage.By Xiangping Li (Thesis)

www.swinburne.edu.au/feis/cmp/publications/thesis/xli_2009.pdf

[3] Five dimensional optical recordingwww.spectrum.ieee.org/fivedimensional-dvd.htm

[4] Nanotech DVD http://www.macworld.com/article/140723/2009/05/nanotech_dvd.htm

[5] Five dimensional optical recording (journal)www.nature.com/nature/journal/v459/n7245/full/nature08053.html

[6] Five dimensional optical recordingTechnology Review (digital magazine)Published by MIThttp://www.technologyreview.com/computing/22673/

THANK YOU

Questions