Magnetic and surface plasmon resonances for periodic lattices of plasmonic split-ring resonators

In this study, the author investigates magnetic and surface plasmon resonances for periodic lattices of plasmonic split-ring resonators by the use of the interface matching method. Magnetic resonance is characterized by a special frequency branch and illustrated with the localized eigenmode patterns. The basic features associated with magnetic resonance are present at the long wavelength as well as at the Bloch wavelength comparable to the size of a unit cell with minor distinctions. Near the surface plasma frequency, a large number of highly resonant branches appear and surface plasmon resonance gradually becomes the dominated feature. By varying the ratio of lattice constant to plasma wavelength, the influence of plasmonic property on magnetic resonance is examined for rather small and large skin depths.