Broadband Light Bending with Plasmonic Nanoantennas

作者：Xingjie Ni, Naresh Kumar Emani, Alexander V. Kildishev, Alexandra Boltasseva, Vladimir M. Shalaev · 发表于：Science · 年份：2011 · DOI：10.1126/science.1214686 · 被引用次数：1475 · 研究领域：Plasmonic and Surface Plasmon Research、Metamaterials and Metasurfaces Applications、Photonic Crystals and Applications

The precise manipulation of a propagating wave using phase control is a fundamental building block of optical systems. The wavefront of a light beam propagating across an interface can be modified arbitrarily by introducing abrupt phase changes. We experimentally demonstrated unparalleled wavefront control in a broadband optical wavelength range from 1.0 to 1.9 micrometers. This is accomplished by using an extremely thin plasmonic layer (~λ/50) consisting of an optical nanoantenna array that provides subwavelength phase manipulation on light propagating across the interface. Anomalous light-bending phenomena, including negative angles of refraction and reflection, are observed in the operational wavelength range.