Abstract
The nonlinear susceptibility and the four-wave mixing signal from assemblies of molecules with nonoverlapping charge distributions and an arbitrary geometry are calculated using Green’s-function techniques. At low molecular density and under off-resonant excitation we recover the local-field approximation. The role of retarded interactions and cooperative spontaneous emission in the electrodynamics of confined excitons in molecular quantum wells is discussed.
- Received 9 February 1993
DOI:https://doi.org/10.1103/PhysRevB.48.2470
©1993 American Physical Society