Invisible Man HG Wells, Sue Richards of the Fantastic Four, the Klingon ships from Star Trek, science fiction has a wide variety of embroidery dreams of invisibility, but in reality, the trick is a little more complicated. In recent years nanotechnology, quantum physics and photonics start to blur the line between reality and fiction with the first cuts that take us to wear the invisibility.
In a laboratory school of engineering at Duke University in North Carolina, David R. Smith and David Schurig have woven the first invisibility cloak. Instead of a right and two setbacks, the tissue is composed these researchers developed a new type of material called "metamaterials" whose special features allow you to open a hole in the fabric of light and thus have a first look at the invisibility .
More than one layer such as Harry Potter, the proposal to Duke University for invisibility armor resembles a silicon and copper. The approach theory for this experiment was published in the journal Science in May last year. But when in November two American and his English colleague Sir John Pendry of Imperial College in London gave the news that had been experimentally his theory, took the world by storm. While it is not the only proposal, if one that has received most attention from the media for being a reality.
Lessons to disappear
We can see an object because light from any source either sun or light reaches it. By giving him some light is absorbed and some "bounce" to us, says Dr. Eric Rose, coordinator Scientific Optics and Radiometry Division of the National Metrology Centre. Our eyes perceive different wavelengths of light reflected from the object and along with the brain process these feelings to rebuild his real form.
Invisibility - define Dr. Rosas - is possible when we get that the object does not reflect or absorb light, ie when we get the light waves passing through its position to reach our eyes without any alteration. To accomplish this two ways: the first would make the object becomes transparent and allows light to pass through. The other way is to make the light rays to bend the path of a light wave will "kick around" the object and continue as if nothing had happened.
If we choose to make transparent an object or person, this means seriously change their chemical composition and thereby jeopardizing its existence. As one of the graces of invisibility is to enjoy it, we can eliminate the first option.
On the contrary if we chose door number two, there are more elements with which we work. Naturally it is possible to "bend" a ray of light through its interaction with the material it touches. One example is the air and water, both media are transparent and allow the passage of light, but altered its original path. When it puts a pencil in a glass of water, pencil appears to break, this optical illusion is caused by the change of path of light passing from one medium to another. This phenomenon is called refraction and is determined by how light interacts with materials. Therefore if we alter the characteristics of the materials upon which impinges a light beam, then you may also change the effects these materials have with light.
Dr. Eric Rose explains that light is a type of electromagnetic radiation such as microwaves, radio waves, X rays or infrared rays. The difference between radiation and the other is the size of the wave or wavelength. The materials do not react equally to all waves, depending on their length, these energies can be absorbed, reflected or deflected. A red shirt, for example, we see red because the material it is made absorbs all colors except red, that is only able to interact with the wavelength of that color. Because the light our eyes can perceive is composed of multiple wavelengths, achieving invisibility "visible" means to get a single material meets a variety of waves.
In a laboratory school of engineering at Duke University in North Carolina, David R. Smith and David Schurig have woven the first invisibility cloak. Instead of a right and two setbacks, the tissue is composed these researchers developed a new type of material called "metamaterials" whose special features allow you to open a hole in the fabric of light and thus have a first look at the invisibility .
More than one layer such as Harry Potter, the proposal to Duke University for invisibility armor resembles a silicon and copper. The approach theory for this experiment was published in the journal Science in May last year. But when in November two American and his English colleague Sir John Pendry of Imperial College in London gave the news that had been experimentally his theory, took the world by storm. While it is not the only proposal, if one that has received most attention from the media for being a reality.
Lessons to disappear
We can see an object because light from any source either sun or light reaches it. By giving him some light is absorbed and some "bounce" to us, says Dr. Eric Rose, coordinator Scientific Optics and Radiometry Division of the National Metrology Centre. Our eyes perceive different wavelengths of light reflected from the object and along with the brain process these feelings to rebuild his real form.
Invisibility - define Dr. Rosas - is possible when we get that the object does not reflect or absorb light, ie when we get the light waves passing through its position to reach our eyes without any alteration. To accomplish this two ways: the first would make the object becomes transparent and allows light to pass through. The other way is to make the light rays to bend the path of a light wave will "kick around" the object and continue as if nothing had happened.
If we choose to make transparent an object or person, this means seriously change their chemical composition and thereby jeopardizing its existence. As one of the graces of invisibility is to enjoy it, we can eliminate the first option.
On the contrary if we chose door number two, there are more elements with which we work. Naturally it is possible to "bend" a ray of light through its interaction with the material it touches. One example is the air and water, both media are transparent and allow the passage of light, but altered its original path. When it puts a pencil in a glass of water, pencil appears to break, this optical illusion is caused by the change of path of light passing from one medium to another. This phenomenon is called refraction and is determined by how light interacts with materials. Therefore if we alter the characteristics of the materials upon which impinges a light beam, then you may also change the effects these materials have with light.
Dr. Eric Rose explains that light is a type of electromagnetic radiation such as microwaves, radio waves, X rays or infrared rays. The difference between radiation and the other is the size of the wave or wavelength. The materials do not react equally to all waves, depending on their length, these energies can be absorbed, reflected or deflected. A red shirt, for example, we see red because the material it is made absorbs all colors except red, that is only able to interact with the wavelength of that color. Because the light our eyes can perceive is composed of multiple wavelengths, achieving invisibility "visible" means to get a single material meets a variety of waves.
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