Invisibility Cloaks That Can Be Turned On & Off At Will
Invisibility Cloaks have amused physicists and scientists for a long time and since the last few years various attempts are made at building such cloaks. We told you about an invisibility cloak that could #-Link-Snipped-#, a #-Link-Snipped-#, and even #-Link-Snipped-# and though unrelated, very recently we saw about a cloak #-Link-Snipped-#. This time, we have folks from University of St. Andrews, Scotland who are successful at creating an optical invisibility cloak that you can turn on and off as you wish. They used a concept of 'electromagnetically induced transparency' in which some materials exhibit the property of being transparent when exposed to laser light.
![[IMG]](proxy.php?image=http%3A%2F%2Fwww.crazyengineers.com%2Fwp-content%2Fuploads%2F2012%2F06%2FElectromagnetically-induced-cloaking.png&hash=0e0421ad6263b71e9939c918f92af392)
A cloaking device consists of a transparent mantel that encloses the object to be hidden. The mantel refracts light around its hidden interior such that light exits as if it had traversed empty or uniform space, thus hiding the object and the act of hiding itself. The team behind this project has used the material with five electronic states rather than three, allowing them additional control over the refractive index called magneto-electric cross-coupling.
A great thing about their technique is that this electromagnetically induced cloak is easier to make than the conventional way of nanoscale engineering to bend light in a required way. They just create the cloak like any other dope material and place it in a magnetic field, which can of course be turned on and off with the flick of a switch. You may want to check out the PDF for details #-Link-Snipped-#.
Via: #-Link-Snipped-#
A cloaking device consists of a transparent mantel that encloses the object to be hidden. The mantel refracts light around its hidden interior such that light exits as if it had traversed empty or uniform space, thus hiding the object and the act of hiding itself. The team behind this project has used the material with five electronic states rather than three, allowing them additional control over the refractive index called magneto-electric cross-coupling.
A great thing about their technique is that this electromagnetically induced cloak is easier to make than the conventional way of nanoscale engineering to bend light in a required way. They just create the cloak like any other dope material and place it in a magnetic field, which can of course be turned on and off with the flick of a switch. You may want to check out the PDF for details #-Link-Snipped-#.
Via: #-Link-Snipped-#
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