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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, 2039012010. Here, we focus on the physics of a medium with finite dimensionsconsisting on a square lattice of parallel conducting wires arranged on asub-wavelength scale. This medium supports electromagnetic fields that varymuch faster than the operating wavelength. We show that such modes aredispersive due to the finiteness of the medium. Their dispersion relation isestablished in a simple way, a link with designer plasmons is made, and thecanalization phenomenon is reinterpreted at the light of our model. We explainhow to take advantage of this dispersion in order to code sub-wavelength wavefields in time. Finally, we show that the resonant nature of the medium ensuresan 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 themedium.



Author: Fabrice Lemoult, Geoffroy Lerosey, Mathias Fink

Source: https://arxiv.org/







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