The San Diego group showed that microwaves passing through a small prism of the metamaterial were refracted in the opposite direction of waves passing through a similarly shaped prism of Teflon (Teflon is to microwaves as glass is to visible light).

• 他们让微波通过一小块以此种类材料制成的稜镜，微波折射的方向与通过类似形状的铁氟龙块时相反（微波通过铁氟龙的折射率，相当于可见光通过玻璃的折射率）。