3D OPTICAL A generation in Optical Data Storage Technology

V KRANTHI KIRAN 08B21A0493 4th ECE ABSTRACT

Storing data is becoming an important task in our regular e-life, this process is having a great history as magnetic tapes, gramophone records, floppy disks, disks, flash cards and so on. So the change is in the amount of size of data it can store and the space occupied of disk. For this 3D optical type is going to be a best alternative. CONTENTS

• HISTORY • MEDIA DESIGN • PROCESSES FOR CREATING WRITTEN DATA • PROCESSES FOR READING DATA • DRIVE DESIGN • DEVELOPMENT ISSUES • APPLICATIONS • CONCLUSION HISTORY

• MAGNETIC TAPES • HARD DISKS • OPTICAL DISKS • FLASH DRIVES so on.

– 1980s Peter T. Rentzepis MEDIA DESIGN

• The active part of 3D optical storage media is usually an organic either doped or grafted with the photochemically active species. • This photo sensitivity is the main aspect in reading data in some methods. PROCESSES FOR CREATING WRITTEN DATA

• Data recording in a 3D optical storage medium requires that a change take place in the medium upon excitation • If the photochemical change is reversible, then rewritable data storage may be achieved • multilevel recording, where data is written in ‘grayscale’ rather than as ‘on’ and ‘off’ signals PROCESSES FOR READING DATA

• Reading of data from 3D optical memories has been carried out in many different ways. – Measurement of small differences in the between the two data states. – Linear excitation of - has some potential problems because the addressing light interacts with many other data points Each spot is located using the tracking data path.

DRIVE DESIGN

• - 532 nm - solid-state or pulsed lasers • Optical system- must combine and separate different colours of light as required • Detection- special light collection optics • Data tracking- Once the data is identified along the z-axis its similar to routine.

DEVELOPMENT ISSUES

• Destructive reading- use of different absorption bands for each process • Thermodynamic stability- extensive research was conducted to find more stable chromophores for 3D memories • Media sensitivity- Researchers typically use Ti- lasers to achieve excitation APPLICATIONS

• Wide chance of storing data in a less space such as a DVD • Servers • Databases • Social networking And so on as we need to save the data………… CONCLUSION

• 3D optical data storage is the form of optical data storage which is really a good alternative for the data storage required in now-a-days life which is having a lot of data to store. As it can store about 217 DVD’s in a single disc. REFERENCE

• http://en.wikipedia.org/wiki/3D_optical_data_storage • http://www.riken.jp/lab- www/library/publication/review/pdf/No_49/49_052.pdf • http://www.rsc.qut.edu.au/studentsstaff/training/Posters/QU T%20Research%20Poster_Sando.pdf THANK YOU