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Cloaking device developed

Cloaking device developed

Researchers from The University of Texas at Austin have reported what they believe to be the first experimental verification of a 3D stand-alone cloak in free space, achieved by applying the plasmonic cloaking technique to a finite cylinder approximately two wavelengths long illuminated by microwave radiation.

The  application of the plasmonic cloaking technique causes scattering suppression of microwaves from a finite-length dielectric cylinder. The scattering suppression is obtained all around the object in the near-and far-field and for different incidence angles.

What this means is that the plasmonic cloak only works for waves in the microwave region of the electromagnetic spectrum. It uses a shell of what are known as plasmonic materials; they present a “photo negative” of the object being cloaked, effectively cancelling it out.

Most other experimentation in this field has focused on the engineering of “metamaterials” – modifying materials to have properties that cannot be found in nature.

The modifications allow metamaterials to guide and channel light in unusual ways – specifically, to make the light rays arrive as if they had not passed over or been reflected by a cloaked object.

Previous efforts that have made 3-D objects disappear have relied upon a “carpet cloak” idea, in which the object to be cloaked is overlaid with a “carpet” of metamaterial that bends light so as to make the object invisible.
 

Read more at New Journal of Physics

 

About Author

Stuart Davidson

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