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Terahertz Emission in Asymmetric Quantum Wells by Frequency Mixing of Midinfrared Waves

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3 Author(s)
Dupont, E. ; Inst. for Microstructural Sci., Nat. Res. Council, Ottawa, Ont. ; Wasilewski, Z.R. ; Liu, H.C.

Generation of terahertz (THz), and sub-THz, coherent waves has been demonstrated at room temperature in GaAs-AlGaAs asymmetric quantum wells by mixing two CO2 laser beams. Two overlapping regimes were studied: the double resonance regime where three states are involved and the optical rectification which relies on two states only. The measured conversion efficiency of ~10-7 W-1 is in reasonable agreement with theoretical predictions. In addition, this technique of THz generation provides a model system to study the emission profile from an ensemble of radiating dipoles. For instance, backward emission and strong diffraction effects have been observed

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Quantum Electronics, IEEE Journal of  (Volume:42 ,  Issue: 11 )