Cloaking devices inch towards visible wavelengths

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Cloaking devices and metamaterials are hot topics in the realm of science where optics blurs into materials science. By crafting materials that can interact with specific wavelengths of light, researchers have been able to steer that light around small objects, essentially cloaking the object at those wavelengths. The problem so far is that many of these materials are very specific about the wavelengths they work at, and none of those were in the visible spectrum. Now, researchers have designed a cloaking material that operates across a range of the near-infrared, and suggest it should be possible to bring things down to the visible spectrum.

The material was used in a test setup that's similar to one that was used in past work in the microwave range. The setup can basically be described as a mirror with a bump. When light hits it directly, the bump acts a bit like a funhouse mirror, distorting the reflection. The cloaking device can be put down on top of the bump and steer light waves in a way that makes it look as if neither the bump nor the cloak were there, producing reflections as if there were a smooth, undistorted mirror in place.

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A tiny "carpet cloak" that makes objects invisible to optical light has been made by a US research team.

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Cloaking devices inch towards visible wavelengths

Cloaking devices inch towards visible wavelengths

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