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The trick is to change the speed and direction in which light travels through the material - that is, to change the material's refractive index...

2010-03-18

 3D Invisibility light vision slow light
Researchers have trapped a rainbow - slowing light to a near-stop - in an array of 25,000 "invisibility cloaks", each smaller than a hair's breadth...

2012-05-25

 cloaking slow light light speed