An anonymous reader writes with the latest advance in the quest for a cloak of invisibility (Michigan Tech University’s press release). We’ve been following this research as it develops; here a story in each of the last four years. “Invisibility cloaks are slowly working their way up to shorter wavelengths — starting at millimeter-long microwaves and working their way to the nanometer wavelengths of visible light. EETimes says we are about half way there — micrometer wavelengths — in this story about using chalcogenide glass to create invisibility cloaks in the infrared. Quoting: ‘Invisibility cloaks cast in chalcogenide glass can render objects invisible to infrared frequencies of light, according to researchers at Michigan Technological University… 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… claim that by substituting nonmetallic glass resonators made from chalcogenide glass, infrared cloaks are possible too…’”

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