From fun-house mirrors to holograms, we have all experienced incredible optical illusions. Right now, scientists are fascinated by the prospect of finding a way to perform an even more challenging trick: hiding things in plain sight.
We've made some metamaterials that have refractive indices that can redirect particular wavelengths of light. But one issue scientists have found particularly difficult to address is how to mask corners. Sharp corners are pretty common, and it's difficult to figure out ways to guide the surface waves of light around corners, as the light experiences scattering loss when encountering sharp corners. That's because there is a large mismatch in momentum of the light waves at the surface of an object before and after passing around the corner of an extremely compact shape.
Though scientists have successfully developed a few materials that can perform scattering-free guidance of surface waves around corners, these methods are limited. They rely on photonic crystals with a large magnetic response, which limits the types of waves it can influence.
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