This is an amazing breakthrough and one that has practical applications
A simple-to-make “superlens” can focus 10 times more sharply than a conventional lens. It could shrink the size of features on computer chips, or help power gadgets without wires.
No matter how powerful a conventional lens, it cannot focus light down to more than about half its wavelength, the “diffraction limit“. This limits the amount of data that can be stored on a CD, and the size of features on computer chips.
But such complex mixes of material stuffed with tiny loops of metal and precisely-shaped holes are unlikely to become a mass-production technology.