  We demonstrated a two-fold acceleration of the fast time constant
characterising the recovery of a P-doped Indium-Phosphide Photonic Crystal
all-optical gate. Time-resolved spectral analysis is compared with a
three-dimensional drift-diffusion model for the carrier dynamics, demonstrating
the transition from the ambipolar to the faster minority carrier dominated
diffusion regime. This open the perspective for faster yet efficient
nanophotonic all-optical gates.
