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We demonstrate that the fluorescent emitters can increase light emission fromthe plasmonic nanostructures in turn. With the help of atomic force microscopy,a hybrid system consisting of a fluorescent nanodiamond and a gold nanoparticlewas assembled step-by-step for in situ optical measurements. We found that theemission from the nanoparticle increased compared with that before coupling.The interaction between plasmonic nanostructures and fluorescent emitter wasunderstood as an entity based on the concept of a quantized optical cavity byconsidering the nanodiamond and the nanoparticle as a two-level energy systemand a nanoresonator, respectively. The theoretical calculations reveal thatboth the plasmonic coupling effect and the dielectric nanoantenna effectcontribute to the enhancement of light emission from the gold nanoparticles.

Mutually enhancing light emission between plasmonic nanostructures and fluorescent emitters