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We demonstrate that a periodic array of optical antennas sustains a resonantNear-Field (NF) and an anti-resonant Far-Field (FF) at the same energy andin-plane momentum. This phenomenon arises in the context of coupled plasmoniclattice resonances, whose bright and dark character is interchanged at acritical antenna length. The energies of these modes anti-cross in the FF, butcross in the NF. Hence, we observe an extremely narrow bandwidth emissionenhancement from quantum dots in the proximity of the array, while the antennasscatter minimally into the FF. Simulations reveal that a standing wave with aquadrupolar field distribution is the origin of this dark collective resonance.

Near-Field Resonance at Far-Field Anti-Resonance: Plasmonically Enhanced Light Emission with Minimum Scattering Nanoantennas