Coated Sapphire Is Invisible to Infrared Cameras

Coated Sapphire Is Invisible to Infrared Cameras : Discovery News: "Now new technology from researchers at Harvard School of Engineering and Applied Sciences could turn infrared detection on its head. The technique not only makes hot objects appear cold to infrared detectors -- which could help hide soliders from their enemies at night -- but it can be also used to make an infrared camera so sensitive that even cold objects would look relatively bright."