We introduce a novel approach to assemble fundamental nanophotonic model systems. The approach is based
on the controlled manipulation of single quantum emitters (defect centers in diamond) via scanning probes.
We demonstrate coupling of a single diamond nanocrystal to a planar photonic crystal double-heterostructure
cavity as well as to a silica toroidal resonator. Our studies represent an important step towards well-controlled
cavity-QED experiments with single defect centers in diamond.