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From EETimes:
Metamaterials absorbing incident microwaves, instead of diverting them around objects like an invisibility cloak, prompted Chinese researchers at Southeast University in Nanjing to claim they are created an "electromagnetic black hole."
The concentric circles of metamaterials that act as an almost perfect "black body"—absorbing nearly all incident microwaves and converting it them to heat—hold the promise of enabling novel antennas, electromagnetic-wave harvesters and super-efficient thermal emitters, according to the researchers.
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Re: 'Black Hole' Constructed from Metamaterials
