Technology Review 10/14
Their black hole consists of 60 layers of printed circuit board arranged in concentric circles. The printed circuit boards are coated in a thin layer of copper from which Qiang and Tie have etched two types of pattern that either resonate at microwave frequency or do not.
The metamaterial distorts space so severely that light or microwaves entering it cannot escape. The energy absorbed by the black hole is emitted as heat.
