Here's what EETimes says about infrared invisibility cloaks: Invisibility cloaks cast in chalcogenide glass can render objects invisible to infrared frequencies of light, according to researchers at Michigan Technological University. Created by professor Elena Semouchkina and others at Michigan Tech and Pennsylvania State University, the glass cloak is currently being adapted to work in visible wavelengths....Most other demonstrations of invisibility cloaks have used metamaterials composed of free-space split-ring resonators that were constructed from metal printed-circuit board traces surrounded by traditional dielectric material. The Michigan Tech researchers have already demonstrated such cloaks at microwave frequencies. They now claim that by substituting nonmetallic glass resonators made from chalcogenide glass, infrared cloaks are possible too...
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