Lately, we have been discussing about the so called negative refractive index materials (Meta Materials!), an example of which is a super-lens. I found this paper in the Arxiv web site, that negates the whole idea of -ive refraction. Some of you might find it interesting.
Cheers
Shakil
http://arxiv.org/abs/0712.0605v1
"Correct Definition of the Poynting Vector in Electrically and Magnetically Polarizable Medium Reveals that Negative Refraction is Impossible"
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