  We study plasmon-exciton interaction by using topological singularities to
spatially confine, selectively deliver, cotrap and optically probe colloidal
semiconductor and plasmonic nanoparticles. The interaction is monitored in a
single quantum system in the bulk of a liquid crystal medium where
nanoparticles are manipulated and nanoconfined far from dielectric interfaces
using laser tweezers and topological configurations are spatially colocated
with a plasmonic gold nanoburst particle in a topological singularity core, its
fluorescence increases because blinking is significantly suppressed and the
radiative decay rate increases by nearly an order of magnitude owing to the
Purcell effect. We argue that the blinking suppression is the result of the
radiative rate change that mitigates Auger recombination and quantum dot
ionization, consequently reducing nonradiative recombination. Our work
demonstrates that topological singularities are an effective platform for
studying and controlling plasmon-exciton interactions.
