title: Broadband light bending with plasmonic nanoantennas.
abstract: 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.
authors.affiliation: School of Electrical and Computer Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, USA.
authors.forename: Xingjie
authors.initials: X
authors.lastname: Ni
authors.forename: Naresh K
authors.initials: NK
authors.lastname: Emani
authors.forename: Alexander V
authors.initials: AV
authors.lastname: Kildishev
authors.forename: Alexandra
authors.initials: A
authors.lastname: Boltasseva
authors.forename: Vladimir M
authors.initials: VM
authors.lastname: Shalaev