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Semiconductor quantum dots (QDs) provide an essential link between light andmatter in emerging fields such as light-harvesting, all-solid-state quantumcommunication, and quantum computing. QDs are excellent single-photon sourcesand can store quantum bits for extended periods making them promisinginterconnects between light and matter in integrated quantum informationnetworks. To this end the light-matter interaction strength must be stronglyenhanced using nanophotonic structures such as photonic crystal cavities andwaveguides or plasmonic nanowires. So far it has been assumed that QDs can betreated just like atomic photon emitters where the spatial properties of thewavefunction can be safely ignored. Here we demonstrate that the point-emitterdescription for QDs near plasmonic nanostructures breaks down. We observe thatthe QDs can excite plasmons eight times more efficiently depending on theirorientation due to their mesoscopic character. Either enhancement or suppresionof the rate of plasmon excitation is observed depending on the geometry of theplasmonic nanostructure in full agreement with a new theory. This discovery hasno equivalence in atomic systems and paves the way for novel nanophotonicdevices that exploit the extended size of QDs as a resource for increasing thelight-matter interaction strength.

Strongly modified plasmon–matter interaction with mesoscopic quantum emitters