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quinta-feira, 23 de setembro de 2010

Luz visível para substituír Raios X

Estão-se a desenvolver maneiras de usar luz visível como uma alternativa aos Raios X:

Alternative to X-Rays Makes Its First Step
By Charles Q. Choi, LiveScience Contributor

The initial object imaged through a layer of white paint (A) was a 32-pixel by 32-pixel image of a flower; the image was reconstructed with a new technique (B), matching the original by roughly 94.5 percent. Credit: Sylvain Gigan et al.

A day when doctors need only visible light instead of X-rays to view a patient's innards can now be more easily imagined, with the announcement of a way to decipher the little light that passes through opaque materials.
Normally, one cannot see through opaque barriers such as paint, skin, fabric or eggshells because any light that does manage to make it through such materials is scattered in complicated and seemingly random ways. [Infographic: How Light Works]

E a Seda, como material para uma Capa de Invisibilidade!

Invisibility Cloak Made From Silk
A material used for thousands of years could be key to creating a soft, Harry Potter-style invisibility cloak.

By Eric Bland 

For thousands of years people have worn shimmering silk to stand out in a crowd. Within the next few years people could wear silk to become invisible in a a crowd.
For the first time ever, scientists have created an invisibility cloak made from silk, and coated in gold.
The new metamaterial, as invisibility cloaks and their kin are technically called, only works on relatively long terahertz waves (a region of the electromagnetic spectrum between radio and infrared light), but the Boston-area scientists who developed the technology think that silk could work as an invisibility cloak at much smaller wavelengths, even in the visible range.
The research could lead to a wide range of optically unique materials for use in biomedicine or defense.

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