Hou, Y.; Liu, J. R.; Buchanan, M.; Thorpe, A. J. S.; Poole, P. J.; Liu, H. C.; Wu, K.; Roorda, S.; Zhang, X. P. Terahertz Generation Using Implanted InGaAs Photomixers and Multi-Wavelength Quantum Dot Lasers. Nano-Micro Lett 2012, 4, 10-13.