Like other invisibility cloaks, this system works to wrap light around the object. The fingers are still visible to the human eye -- I mean, they're not really invisible -- but the light that hits the top of the contacts is redirected to the solar panel underneath through some tricky physics. The team is currently looking at two alternative methods for accomplishing this feat. The first method involves wrapping the fingers in a polymer coating with a precisely tuned refractive index. The other involves etching grooves into the fingers themselves that refract light around the components. Current computer models of both methods suggest that panel efficiencies would increase by about 10 percent should the contact fingers be made to disappear.

[Image Credit: KIT]