Revisiting the wire medium: a resonant metalens

Abstract

This article is the first one in a series of two dealing with the concept of "resonant metalens" we recently introduced [Phys. Rev. Lett. 104, 203901 (2010)]. Here, we focus on the physics of a medium with finite dimensions consisting on a square lattice of parallel conducting wires arranged on a sub-wavelength scale. This medium supports electromagnetic fields that vary much faster than the operating wavelength. We show that such modes are dispersive due to the finiteness of the medium. Their dispersion relation is established in a simple way, a link with designer plasmons is made, and the canalization phenomenon is reinterpreted at the light of our model. We explain how to take advantage of this dispersion in order to code sub-wavelength wave fields in time. Finally, we show that the resonant nature of the medium ensures an efficient coupling of these modes with free space propagating waves and, thanks to the Purcell effect, with a source placed in the near field of the medium.

References in corpus (2)

• Resonant Metalenses for Breaking the Diffraction Barrier
• Guiding, focusing, and sensing on the sub-wavelength scale using metallic wire arrays

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• Measuring Dirac Cones in a Sub-Wavelength Metamaterial
• Single-mode subwavelength waveguides with wire metamaterials
• Exploiting spatiotemporal degrees of freedom for far field subwavelength focusing using time reversal in fractals
• The homogenisation of Maxwell's equations with applications to photonic crystals and localised waveforms on metafilms
• Multiple scattering enabled superdirectivity from a subwavelength ensemble of resonators