Excitonic nonlinear shifts in photonic crystal nanocavities with buried multiple quantum wells

This is the authors' abstract. We don't add key points for this paper.

We investigate strong excitonic absorption and large nonlinear wavelength shifts in buried multiple-quantum-well photonic crystal L3 nanocavities that well confine the carriers. The confined carriers can survive as long as the radiative lifetime because carrier diffusion is negligible and surface recombination is well suppressed. In addition, strong optical confinement and small mode volume provided by photonic crystals can enhance excitonic nonlinearity. Therefore, our structure shows a strong excitonic effect that induces large refractive index changes by exciton bleaching and exhibits a large cavity-frequency shift. Our results will contribute to the development of ultralow energy all-optical switching devices in the future.