Experimental Demonstration of In-Plane Negative-Angle Refraction with an Array of Silicon Nanoposts Wu, Aimin ; Li, Hao ; Du, Junjie ; Ni, Xingjie ; Ye, Ziliang ; Wang, Yuan ; Sheng, Zhen ; Zou, Shichang ; Gan, Fuwan ; Zhang, Xiang ; Wang, Xi Abstract Publication: Nano Letters Pub Date: March 2015 DOI: 10.1021/nl5049516 Bibcode: 2015NanoL..15.2055W