Invisible tunnel design: Create an electromagnetic

It could be called Harry Porter's invisibility sleeve. New calculations have found a way to create an electromagnetic " wormhole " - an invisible tube seen from the sides, allowing light to enter the center to be invisible.

The idea was to create a twist on the spherical invisible cloak proposed last year. Such a device must be made of metamaterials, consisting of a stack of metal circles or other shapes, capable of bending light in very good ways. The metamorphic crust of the basic principle can transmit light around its inner space without reducing the speed of light, making it invisible to the outside world.

But the invisible is also good and bad. If the light doesn't get inside, nothing can be seen in the gown from outside, said University of Rochester mathematician Allan Greenleaf.

Light at the end of the invisible tunnel.The researchers imagined a blueprint for a 'wormhole' , which allowed light to move invisible from one point to another. (Photo: ISTOCKPHOTO / GEORGE CAIRNS)

So Mr. Greenleaf has become the inside of the cloak out. In the study published in a topical physics journal, he and his colleagues reported that the procedure to bend light is effective for open tubes with flared ends. When looking straight, the light running along the cylinder becomes invisible. But looking from the side, it seemed that the light did not come from any point as if the light had detoured to another dimension and turned back.

This idea is like the idea of ​​a wormhole connecting two points away from each other in space so this idea is called ' wormhole '. 'We deceive electromagnetic waves making them think that the space has really been altered,' said Greenleaf.

'It is a beautiful twist' on this spherical robe, physicist John Pendry of London Royal College, one of the first physicists to come up with this idea, said. 'We can create a secret path between the two parts in space and that is interesting.'

Creating an invisible tunnel is difficult or difficult depending on your level of optimism when creating a spherical cloak, Greenleaf said. A Duke University team demonstrated the operation of an imperfect cloak last year, which curves the microwaves around a plate of copper concentric circles. However, researchers are still working hard to create metamaterials that can bend visible light.

Greenleaf's team said that the wormhole could be used to transfer metal objects into an MRI scanner or be used to create 3-D video images by creating a picture. Bridge with spikes. Of course, when it is easy to achieve invisible, modern technology will probably become a bit outdated.

Thanh Van