Plasmon coupling in vertical split-ring resonator metamolecules

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Abstract
The past decade has seen a number of interesting designs proposed and implemented togenerate artificial magnetism at optical frequencies using plasmonic metamaterials,but owing to the planar configurations of typically fabricated metamolecules thatmake up the metamaterials, the magnetic response is mainly driven by the electricfield of the incident electromagnetic wave. We recently fabricated verticalsplit-ring resonators (VSRRs) which behave as magnetic metamolecules sensitive toboth incident electric and magnetic fields with stronger induced magnetic dipolemoment upon excitation in comparison to planar SRRs. The fabrication techniqueenabled us to study the plasmon coupling between VSRRs that stand up side by sidewhere the coupling strength can be precisely controlled by varying the gap inbetween. The resulting wide tuning range of these resonance modes offers thepossibility of developing frequency selective functional devices such as sensors andfilters based on plasmon coupling with high sensitivity.

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