Resonant energy transfer between two defects in a photonic band gap system

The wave interference behaviors between two interacting defects in a two-dimensional photonic band gap system are studied by numerical simulation using multiple-scattering theory. By injecting electromagnetic wave energy at one defect at the center, we find oscillatory resonant energy transfer between two defects when both defect mode frequencies lie inside a full gap. When one of the defect mode frequency merges with the pass band forming a resonant state, energy leakage as well as frequency modulation are observed due to the interaction among the defect mode, the resonant states, and the band states. Such kind of phenomena resemble the time evolution of atomic population occurs in spontaneous emission from an atom embedded in a photonic band gap structure. These classical resonant behaviors can be observed in simple experiments with 2D photonic band gap systems