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It's not that new by the looks of it...and it's man made anyway...also...I don't think it's a black hole as such...it's just that the refractive properties of the substance bend the light to such a degree where it won't escape...optical fiber sort of does a similar thing because it needs to keep light inside, until it reaches the other end, and the light is transformed back into electrical signals...it's very different to how a black hole works...they just keep the light bouncing around inside the metamaterial most likely...
Metamaterials are artificial materials engineered to provide properties which "may not be readily available in nature"