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Plasmonic nano-antennas can focus light to nanometre length-scales providingintense field enhancements. For the tightest optical confinements (0.5-5 nm)achieved in plasmonic gaps, the gap spacing, refractive index, and facet widthplay a dominant role in determining the optical properties making tuningthrough antenna shape challenging. We show here that controlling thesurrounding refractive index instead allows both efficient frequency tuning andenhanced in/output-coupling through retardation matching as this allows darkmodes to become optically active, improving widespread functionalities.

Boosting Optical Nanocavity Coupling by Retardation Matching to Dark Modes