Terahertz (THz) technology is becoming increasingly important in both science and technology. THz timedomain spectroscopy (THz-TDS) and THz quantum cascade lasers (QCLs) provide a powerful tool to explore the nature of various kinds of materials for a low energy excitation and ultrafast dynamics; the THz imaging is expected to be applicable to security, factory testing and so on. Thus THz-TDS and QCLs have triggered the research field of THz-technology-based basic research and application research. In addition to those activities, the development of ultrafast devices and logic circuits in the fields of THz photonics and THz electronics has accelerated the growth of the THz research field such as THz wireless communication, THz network system, ultrafast ADCs and so on. This paper reviews the future prospect of such THz-technology-based research fields.
