Physicists simply conjure hand size cylinders away.

Transparency and invisibility from all angles of vision - Comment on 2013 March 26 (2)

Website: countdown4us.com
Home | Comments | Creation | Redemption Period | Miscellaneous
Home > Comments > 2013 > Comment on 2013 March 26 (2)
2008 | 2009 | 2010 | 2011 | 2012  |  2013 |
End: Go to the end of this webpage.

The researchers extinguished the radiation reflected by the cylinder with a finely meshed copper grid. Electromagnetic fields, among them light and microwaves, consist of waves. We see objects because they reflect these waves. When the spread fields from the camouflage coat and the object interfere, they extinguish each other, and the total impression is transparency and invisibility from all angles of vision. Read more:

Here news from physics:

 

Physics

Physicists simply conjure hand size cylinder away

Is this a new step to let things become invisible? A finely meshed copper grid swallows the radiation reflected from the object. Though this just works in the microwave range.

With a new camouflage coat researchers have let an about hand size cylinder disappear though first in the range of microwaves. The scientists used a wafer-thin, fine copper grid to make the cylinder invisible for microwaves.

"In principle this technique can also be applied for light."

Microwaves and light are different ranges of the electromagnetic spectrum and merely differ in wavelength. But to let an object disappear in visible light remains a great challenge.

The team used a new start: Instead employing so-called meta materials, which are supposed to steer the light around an object, the researchers extinguished the radiation reflected by the cylinder with a finely meshed copper grid. Electromagnetic fields, among them light and microwaves, consist of waves. We see objects because they reflect these waves.

But: "When the spread fields from the camouflage coat and the object interfere, they extinguish each other, and the total impression is transparency and invisibility from all angles of vision."

The researchers demonstrate the function of their camouflage coat with an 18 centimetre cylinder. But they start out that also asymmetric or irregular objects can get hidden. The camouflage coat constructed by them consists of a copper net only 66 thousands of a millimetre thin on a 0.1 millimetre thin plastic film and in principle can be laid around every form.

"The advantages of this camouflage coat process against existing techniques are its form fitting ability, the simple production and the improved range."

With range the physicists denote the sector out of the electromagnetic spectrum in which the camouflage coat works.

In future the team also wants to test the technique in visible light. "Such "meta screens" can actually be realized easier for visible frequencies than voluminous meta materials, and this concept could bring us closer to a practical realization."

"Though the size of the objects, which can effectively be hidden with this method, shrinks with the wavelength, so that we perhaps can effectively stop the spread of micrometre objects with optical frequencies." A micrometre is a thousandth of a millimetre.

According to the physicists the technique could however also be used for other applications like nano switches or non-invasive sensors, from which among others biomedical and optical techniques could profit.

 

Back to: 2013 March 26 (2)
Top: Go to the top of this webpage.
2008 | 2009 | 2010 | 2011 | 2012  |  2013 |
Home | Comments | Creation | Redemption Period | Miscellaneous
Site Map: For an overview of this website and for access to the individual webpages.
The web address of this webpage is:
http://www.countdown4us.com/en022013/en022013093.htm