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Metasurfaces offer great potential to control near- and far-fields throughengineering of optical properties of elementary cells or meta-atoms. Suchperspective opens a route to efficient manipulation of the optical signals bothat nanoscale and in photonics applications. In this paper we show that by usingan effective surface conductivity tensor it is possible to unambigiouslydescribe optical properties of an anisotropic metasurface in the far- andnear-field regimes. We begin with retrieving the effective surface conductivitytensor from the comparative analysis of experimental and numerical reflectancespectra of a metasurface composed of elliptical gold nanoparticles. Afterwardsrestored conductivities are validated in the crosscheck versus semianalyticparameters obtained with the discrete dipole model with and without dipolesinteraction contribution. The obtained effective parameters are further usedfor the dispersion analysis of surface plasmons localized at the metasurface.The effective medium model predicts existence of both TE- and TM-polarizedplasmons in a wide range of optical frequencies and describes peculiarities oftheir dispersion, in particularly, topological transition from the ellipticalto hyperbolic regime with eligible accuracy. The analysis in question offers asimple practical way to describe properties of metasurfaces including ones inthe near-field zone by extracting effective parameters from the convenientfar-field characterisation.

Effective surface conductivity of plasmonic metasurfaces: from far-field characterization to surface wave analysis