>To the best of my knowledge, (this isn't my field) nobody has ever made a visible-light metamaterial.

http://eurekalert.org/pub_releases/2007-01/dl-mft010407.php?...

http://www.photonics.com/Article.aspx?AID=42007

http://www.popsci.com/science/article/2012-04/nanofishnet-co...