Small optical microresonators are structures which confine light to volumes with dimensions on the order of one wavelength
and provide an important means for controlling light-matter interaction in integrated optics. In this Paper, we would
like to present our work on the study of the interaction of single quantum emitters or nanoparticles located in the confined
optical field of a single-mode microresonator. The interaction possibilities between a general photonic system and
a quantum system are discussed, with special focus on the effect of resonant microcavities. For the case of the optical
microresonator used in our experiments, we present a model based on the transfer matrix method which can analytically
describe the radiative enhancement of even complex resonator geometries. This allows not only the optimization of resonator
geometries, but gives accurate information on the radiative processes occurring in the cavity, allowing the extraction
of information normally inaccessible in optical measurements.
Recent developments in nanofabrication and optical near-field metrology have faced complementary modeling
techniques with new demands. We present a surface integral formulation that accurately describes the extreme
near-field of a plasmonic nanoparticle in addition to its far-field properties. Flexible surface meshing gives precise
control over even complex geometries allowing investigation of the effects of fabrication accuracy and material
homogeneity on a particle's optical response. Using this technique, the influence of a particle's symmetry and
shape on surrounding "hot spots" of extremely large field enhancement is explored, giving insight into the
mechanisms of surface enhanced Raman scattering and single-molecule detection techniques.
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