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Plasmonic nanoantennas, the properties of which are essentially determined bytheir resonance modes, are of interest both fundamentally and for variousapplications. Antennas with various shapes, geometries and compositions havebeen demonstrated, each possessing unique properties and potentialapplications. Here, we propose the use of a sidewall coating as an additionaldegree of freedom to manipulate plasmonic gap cavity modes in strongly coupledmetallic nanodisks. It is demonstrated that for a dielectric middle layer witha thickness of a few tens of nanometers and a sidewall plasmonic coating ofmore than ten nanometers, the usual optical magnetic resonance modes areeliminated, and only magnetic toroid-like modes are sustainable in the infraredand visible regime. All of these deep-subwavelength modes can be interpreted asan interference effect from the gap surface plasmon polaritons. Our resultswill be useful in nanoantenna design, high-Q cavity sensing, structuredlight-beam generation, and photon emission engineering.

Core-Shell Structured Dielectric-Metal Circular Nanodisk Antenna: Gap Plasmon Assisted Magnetic Toroid-like Cavity Modes