There's also the possibility of using Metamaterials as defensive armour.  The current interest for military applications is giving an opaque surface a ridiculous refractive index and therefore making it invisible.  Far as I understand it, the theory behind Metamaterials is every substance, including completely opaques like concrete, have a refractive index; a Metamaterial coating can be made to alter this to anything at all.

So, maybe a perfect mirror surface isn't beyond the realms of possibility but the way it'd be created would be totally different from the way we'd expect. 

Then again, I could have it totally bass ackwards and be barking up the wrong tree. :)

Coppula eam se non posit acceptera jocularum.

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