Novel THz-wave detection technique via interaction between optical pumping waves and THz-wave generated by Cherenkov phase matching

THz-wave and optical waves in nonlinear optical process are strongly correlated. Thus, THz-wave information can be transferred to pump and signal wave. THz-wave generated by Cherenkov phase matching can be used as evanescent-probe at interface facet of the crystal. Phase shift and attenuation of reflected THz-wave has information of a sample set at the interface, so the information can be detected by optical analysis for pump and signal wave.