Indeed; I believe they currently do that in some solar cells. I personal favourite are "distributed Bragg reflectors" – they're mirrors, but don't work in the t

Indeed; I believe they currently do that in some solar cells. I personal favourite are "distributed Bragg reflectors" – they're mirrors, but don't work in the traditional sense: http://en.wikipedia.org/wiki/Distributed_Bragg_reflector http://en.wikipedia.org/wiki/Distributed_Bragg_reflector