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JAMES BOND may have to up his game. Cloaking materials can now hide tiny microphones placed on a wall – and they will do the job at all visible wavelengths.
Optical cloaks can hide a free-floating object by bending light all the way around it, but only at specific wavelengths. They are usually made of synthetic metamaterials, which have a structure on a scale smaller than the wavelength of light they are meant to deflect.
Bumps or objects on a floor or wall are relatively easy to hide, since merely…
