C through nanotechnology to put DVD 7 terabytes of data
May 21, 2009 – 7:32 pm
Australian researchers have created a technology that theoretically allows you to record 7.2 terabytes of data on a single disc the size of a normal DVD. That was reported by Nature News, researchers and article appeared in the journal Nature.
In today’s DVD-recording drives the information carried out by means of a laser beam to burn a disc on the surface of the notches. The new technology works the same manner. The main difference is that instead of the appearance of cavities on the surface of the disk melted gold nanoshtyri.
It is a high-density recording of information scientists have achieved with the help of several techniques. First, the researchers used lasers several colors. The point is that the rays of a certain wavelength of an effect only on the pins with a certain ratio of length and thickness. Secondly, researchers have used beams with different polarization, which operate on the pins that are targeted in some way.
Using the rays of different colors and different polarizations, it is possible to record information at one and the same region of the disk several times. For example, two types of polarization and three colors (ie, a total of six possible combinations) you can record 1.6 terabytes of data on a disc the size of a DVD. If we add another option for polarization, you get the disk 7.2 terabytes.
To read the information, researchers are using a weak laser beam, which is not nanoshtyri melts. This outlet is readable signal: empirically established that nanoshtyri “respond” to the laser light is much better than, for example, spherical nanoparticles, which in turn pins after the melt.
weakness of new technology is that the researchers used laser pulses of very short duration – the order of several femtosekund (10-15 seconds), the Lenta.ru. These lasers are expensive and difficult to manufacture. Scientists hope that further development of technology will overcome this limitation. They expected that the industrial use of their discovery to begin in about 2020-s.
