It can be expected that terahertz technology will be one of the major emerging fields of science and technology in the 21st century.
With the development of THz science and technology, its unique superiority and great application prospects in many important fields such as physics, chemistry, electronic information, life sciences, materials science, astronomy, atmospheric and environmental monitoring, communications radar, national security and counter-terrorism, are gradually revealed. Terahertz wave transmission is an important part of the research of terahertz wave communication system, due to the transmission loss of terahertz wave in free space is very large, in a sense it is difficult to guide and control it. To overcome this difficulty, waveguides that can propagate terahertz waves are urgently needed .
Terahertz technology was named by the United States as one of the "top ten technologies that will change the world in the future", and was listed by Japan as the "national pillar of the top ten key strategic objectives" of the first. Terahertz refers to the frequency of 0.1 ~ 10 terahertz band of electromagnetic waves, in the macroscopic classical theory to the microscopic quantum theory, electronics to the photonics of the transition region. Frequency it is higher than microwave, lower than infrared; energy size is between electrons and photons. Because of this cross-transition region, it is neither completely suitable for optical theory to deal with, nor completely suitable for the theory of microwave to study. Therefore, before the 1990s, was once "forgotten", and therefore called "terahertz blank".
Currently, countries have accelerated the exploration of this only insufficiently studied band, setting off a wave of research on terahertz. So, as the fifth dimension of the battlefield space "expander", terahertz in the military field of specific applications? Let's get closer to find out.