Resonant coupling of quantum dot intersublevel transitions with midinfrared photonic crystal modes

We show that quantum dot intersublevel transitions can be coupled to midinfrared photonic crystal modes. The coupling is observed under optical pumping with $S-P$ intersublevel transitions of InGaAs self-assembled quantum dots resonant around $20μm$ wavelength. An enhancement in the intersublevel absorption and a spectral tuning are evidenced when the optical modes of two-dimensional photonic crystals enter in resonance with the photoinduced intersublevel absorption. This effect is illustrated in the case of GaAs two-dimensional photonic crystal membranes with lattice periodicities of 10.5, 9.5, and $8.5μm$ containing multilayers of self-assembled quantum dots.