Spectral Invisibility Cloak

Image: Luis Romero Cortés and José Azaña, Institut National de la Recherche Scientifique

Researchers have demonstrated a new cloaking technique that is effective within broadband light illumination. The technique selectively transfers energy from certain colours of the light wave to other colours. In the example image above, green light energy reflected when light passes through the object is redirected to other parts of the spectrum, effectively cancelling out the colours reflected from an object, making it invisible to the observer.

 

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