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New Device Hides, on Cue, from Infrared Cameras
Published: November 26, 2012. by Harvard University 
Cambridge, Mass. - November 26, 2012 - Now you see it, now you don't. A new device invented at the Harvard School of Engineering and Applied Sciences (SEAS) can absorb 99.75% of infrared light that shines on it. When activated, it appears black to infrared cameras. Composed of just a 180-nanometer-thick layer of vanadium dioxide (VO2) on top of a sheet of sapphire, the device reacts to temperature changes by reflecting dramatically more or less infrared light.
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