Broadband Light Bending with Plasmonic Nanoantennas

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Science  22 Dec 2011:
DOI: 10.1126/science.1214686


The precise manipulation of a propagating wave using phase control is a fundamental building block of optical systems. The wave front of a light beam propagating across an interface can be modified arbitrarily by introducing abrupt phase changes. We experimentally demonstrate unparalleled wave-front 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.