Feeds

DVD plus nano-rods equals security, density: researchers

A little light encryption

Boost IT visibility and business value

Swinburne and Taiwanese researchers have demonstrated technology that can use a single laser beam to create 3D polarization in nanomaterials.

What’s cool about this is that they demonstrate that the polarization can be used to encrypt information – as well as expanding the storage capacity of optical media like DVDs.

As is shown in the illustration at the bottom of this story, the polarization technique – in its infancy at the moment – allows different images to be encoded in one place, showing up depending on the polarization the “read” beam uses.

Using polarization to encode information like this isn’t new: however, achieving 3D polarization using a single beam is, according to the researchers.

As the abstract in Nature states, “arbitrary three-dimensional polarization orientation of a beam hasn’t been achieved yet”.

Gold nano-rods tuned to specific wavelengths are added to the surface of the DVD, according to Swinburne’s Professor Min Gu. The rods are sensitive to the polarization of the “write-laser” – so while one polarization will align some particles in the rods, a different polarization will affect a different set of particles.

Professor Gu says the laser can be polarized “in any direction” – yielding the “arbitrary” polarization referred to in the Nature paper. This characteristic of the laser is what provides both the lift in storage density and the technique’s encryption possibilities. ®

Polarisation used as a kind of steganography

Depending on write polarization, the same area can store different images. Source: Nature

Boost IT visibility and business value

More from The Register

next story
Just TWO climate committee MPs contradict IPCC: The two with SCIENCE degrees
'Greenhouse effect is real, but as for the rest of it ...'
BEST BATTERY EVER: All lithium, all the time, plus a dash of carbon nano-stuff
We have found the Holy Grail (of batteries) - boffins
Asteroid's DINO KILLING SPREE just bad luck – boffins
Sauricide WASN'T inevitable, reckon scientists
Flamewars in SPAAACE: cooler fires hint at energy efficiency
Experiment aboard ISS shows we should all chill out for cleaner engines
Boffins discuss AI space program at hush-hush IARPA confab
IBM, MIT, plenty of others invited to fill Uncle Sam's spy toolchest, but where's Google?
NASA Mars rover FINALLY equals 1973 Soviet benchmark
Yet to surpass ancient Greek one, however
Famous 'Dish' radio telescope to be emptied in budget crisis: CSIRO
Radio astronomy suffering to protect Square Kilometre Array
prev story

Whitepapers

Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
The Essential Guide to IT Transformation
ServiceNow discusses three IT transformations that can help CIO's automate IT services to transform IT and the enterprise.
Consolidation: The Foundation for IT Business Transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.
How modern custom applications can spur business growth
Learn how to create, deploy and manage custom applications without consuming or expanding the need for scarce, expensive IT resources.
Build a business case: developing custom apps
Learn how to maximize the value of custom applications by accelerating and simplifying their development.