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 &mgr;m for quantum dots withAl0.15Ga0.85Asand GaAs as the barrier material. ©1997 American Institute of Physics.