  Exciton-surface plasmon coupling is at the heart of the most elementary
light-matter interactions and is a result of not only an intrinsic property of
the emitter but that of emitter-environment interaction. Thus, change of
electromagnetic environment, as in case of metallic nanoplasmonic structures
and an emitter, significantly modifies the near field light-matter interaction,
which leads to energy transfer in the form of exciton between metallic
nanostructure and the emitter. However, this mechanism remains largely
unexplored. Here, we developed and applied semi-classical electrodynamics
theory and modeling techniques to analyze the energy transfer mechanism in
exciton-surface plasmon coupling. The quantum efficiency of an emitter was
investigated as a function of the location of the emitter with respect to
nanoparticles and their assembles whose local plasmonic field modified by
forming complex coupling modes as well as the local dielectric environment. The
research provided a theoretical insight into fundamental science of
nanophotonics and shed light on unprecedented applications in wide range fields
such as ultra-low power lasers, quantum information processing, photovoltaics,
photocatalysis, and chemical sensing.
