Photoluminescence and far-infrared absorption in Si-doped self-organized InAs quantum dots

We report far-infrared absorption in directly doped self-organized InAs quantum dots. Photoluminescence spectra demonstrate a blue shift in peak intensity for increasing doping in the quantum dots. Far-infrared absorption measurements using a Fourier transform infrared spectrometer show absorption in the range of 13–18 μm for quantum dots with ${\mathrm{Al}}_{\mathrm{0.15}}{\mathrm{Ga}}_{\mathrm{0.85}}\mathrm{As}$ and GaAs as the barrier material.