Phys. Rev. Lett. 101, 113901 (2008) [4 pages]Spatially Shifted Beam Approach to Subwavelength FocusingReceived 16 March 2008; revised 8 August 2008; published 11 September 2008 Although negative-refractive-index metamaterials have successfully achieved subwavelength focusing, image resolution is limited by the presence of losses. In this Letter, a metal transmission screen with subwavelength spaced slots is proposed that focuses the near-field beyond the diffraction limit and, furthermore, is easily scaled from microwave frequencies to the optical regime. An analytical model based on the superposition of shifted-beam patterns is developed that agrees very well with full-wave simulations and is corroborated by experimental results at microwave frequencies. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.113901
DOI:
10.1103/PhysRevLett.101.113901
PACS:
41.20.Jb, 84.40.Ba
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