Terahertz wave Heterodyne Detection based on Parametric Up-conversion at Room Temperature

We propose an optical heterodyne detection method of terahertz wave using parametric up-conversion in a nonlinear LiNbO 3 crystal at room temperature. Nonlinear wavelength upconversion techniques allow the terahertz waves to be visualized and their frequency and intensity determined directly. These are very promising for extending applied research into the terahertz region, and we expect that these will open up new research fields such as information communications and nonlinear optics in the terahertz region.