Enhancement effect of THz emission and detection by THz one-dimensional photonic crystal with a nonlinear material

Recently, several terahertz (THz) wave technologies have been developed not only for spectroscopy of materials but also for application such as imaging for advanced medical science and a security service. However, still now there are some problems in the THz spectroscopic system. For example, the generated THz intensity is not so strong in standard laboratory system. Therefore, a development of lower-priced THz spectroscopic systems with a bright emitter and a sensitive detector is necessary. This paper investigates the use of one-dimensional photonic crystals (1D-PCs) with a nonlinear optical material as the THz emitter and the detector. The enhancement of optical rectification and electro-optical effect in the 1D-PC with a nonlinear material is observed. If the both effects occur at the same time, about 10 times enhancement of THz signal in the THz TDS experiment are expected.