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All-angle negative refraction and active flat lensing of ultraviolet light

Published

Author(s)

Ting Xu, Amit K. Agrawal, Maxim Abashin, Kenneth J. Chau, Henri J. Lezec

Abstract

The ability of a left-handed medium to sustain backwards electromagnetic waves leads to counter-intuitive phenomena such as negative refraction. We report the experimental implementation of a three-dimensional negative-index metamaterial operating at an ultraviolet wavelength of 364nm. The metamaterial, based upon the concept of stacked coupled plasmonic waveguides, is fabricated using alternating layers of Ag and TiO2 and designed to have a quasi-isotropic refractive index close to –1, for both phase and power flow, represents a key step towards implementing the yet-unrealized three-dimensional free-space flat lens or Pendry-Veselago superlens.
Citation
Nature
Volume
497
Issue
7450
Created May 22, 2013, Updated February 19, 2017