. . . . . . . . . . . . . . . . . . . . . . "Single-Molecule Spectroscopic Investigation of EnergyMigration Processes in Cyclic Porphyrin Arrays" . . . . . . . . "Covalently linked cyclic porphyrin arrays have been synthesized to mimic natural light-harvestingapparatuses and to investigate the highly efficient energy migration processes occurring in these systemsfor future applications in molecular photonics. To avoid an ensemble-averaged picture, we performed asingle-molecule spectroscopic study on the energy migration processes of cyclic porphyrin arrays and alinear model compound embedded in a rigid polymer matrix by recording fluorescence intensity trajectories,by performing coincidence measurements, and by doing wide-field defocused imaging. Our studydemonstrates efficient energy migration within the cyclic porphyrin arrays at the single-molecule level. Bycomparison with the data of the linear model compound, we could pinpoint the role of the dipole\u2212dipolecoupling between diporphyrin subunits and the rigidity of the cyclic structures on the energy transferprocesses." . . . .