Focusing Surface Plasmons with a Plasmonic Lens Liu, Zhaowei ; Steele, Jennifer M. ; Srituravanich, Werayut ; Pikus, Yuri ; Sun, Cheng ; Zhang, Xiang Abstract Publication: Nano Letters Pub Date: September 2005 DOI: 10.1021/nl051013j Bibcode: 2005NanoL...5.1726L