Terahertz emission from a coupled multilayer cavity with InAs quantum dots

InAs quantum dots (QDs) were introduced as efficient nonlinear materials into a GaAs/AlAs coupled multilayer cavity, which was recently demonstrated as a novel THz emission device based on difference-frequency generation (DFG) of the two cavity modes. The couple multilayer cavity containing QDs was grown by molecular beam epitaxy and the THz-DFG was measured using femtosecond laser pulses.