A spatially shifted beam approach to subwavelength focusing

Details A spatially shifted beam approach to subwavelength focusing A spatially shifted beam approach to subwavelength focusing

2008-07-04

arxiv.org/abs/0807.0820v2

L. Markley, A. M. H. Wong, Y. Wang, G. V. Eleftheriades, "Spatially shifted beam approach to subwavelength focusing," Physical

Physics

Optics

5 pages, 7 figures. Content updated following reviewer comments to match final published paper

Scientific paper

10.1103/PhysRevLett.101.113901

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.

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