Based on three-dimensional time domain numerical simulations of the nonlinear dispersive Maxwell equations, we find evidence of all optical splitting of defect states in a photonic band gap structure. The result is analogous to the well known Rabi splitting and optical nutation in atomic two-level systems, and can be used for controlled in-gap generation of optical frequencies. Photon-echo-like behavior and third harmonic generation are also investigated.
Conti, C., Di Falco, A., Assanto, G. (2004). Frequency generation within the forbidden band gap: All optical Rabi-like splitting in photonic crystals and microcavities. PHYSICAL REVIEW E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS, 70(6) [10.1103/PhysRevE.70.066614].