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.
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Volume 335 | Issue 6067
27 January 2012
27 January 2012
Copyright © 2012, American Association for the Advancement of Science.
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Received: 30 September 2011
Accepted: 13 December 2011
Published in print: 27 January 2012
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This work was supported by Multidisciplinary University Research Initiative grants (Air Force Office of Scientific Research, FA9550-10-1-0264; Office of Naval Research, N00014-10-1-0942), Air Force Research Lab–Materials and Manufacturing Directorate, and NSF Division of Materials Research (1120923).
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