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We study plasmon-exciton interaction by using topological singularities tospatially confine, selectively deliver, cotrap and optically probe colloidalsemiconductor and plasmonic nanoparticles. The interaction is monitored in asingle quantum system in the bulk of a liquid crystal medium wherenanoparticles are manipulated and nanoconfined far from dielectric interfacesusing laser tweezers and topological configurations are spatially colocatedwith a plasmonic gold nanoburst particle in a topological singularity core, itsfluorescence increases because blinking is significantly suppressed and theradiative decay rate increases by nearly an order of magnitude owing to thePurcell effect. We argue that the blinking suppression is the result of theradiative rate change that mitigates Auger recombination and quantum dotionization, consequently reducing nonradiative recombination. Our workdemonstrates that topological singularities are an effective platform forstudying and controlling plasmon-exciton interactions.

Plasmon-Exciton Interactions Probed Using Spatial Coentrapment of Nanoparticles by Topological Singularities