Terahertz technology revolution
terahertz technology revolution
THZ is a new radiation source, there are a lot of unique advantages; Terahertz technology is a very important cross frontier, to the technology innovation, the development of national economy and national security offers a very attractive opportunity. It can cause people's attention, there are so many application, first, because the material of the terahertz spectrum Including the transmission spectrum and reflection spectrum) Contains very rich physical and chemical information, so the material in the band spectrum is of great significance for investigating the structure of matter; Secondly because terahertz pulse light source compared with the traditional light source have many unique properties.
terahertz ( THz) Radiation between microwave and infrared. With microwave, X-ray, nuclear magnetic resonance ( NMR) Imaging, compared to THZ imaging can not only give the density of the object information, and can give a frequency domain information, as well as within the scope of microwave and optical frequency, X-ray can give material rotation, vibration information. Terahertz radiation, in comparison with other electromagnetic wave spectrum energy is low, it won't cause ionization injury of biological samples, and terahertz radiation can easily through the dielectric material, and thus can be used in safety monitoring of the product. Therefore terahertz imaging technology in biology, industrial safety monitoring may bring new key breakthrough. Infrared, millimeter-wave and terahertz are part of the electromagnetic spectrum. Infrared wavelength range from 0. From 75 to 1000 microns, the frequency range of 400 to 0. 3太赫兹; Millimeter wave wavelength range is 1 ~ 100 millimeter, frequency of 30 ~ 300 GHZ, namely zero. 03 ~ 0. 3太赫兹; Terahertz 'refers to the frequency at 0. 1 - 10 THZ range of electromagnetic waves. It in the long wave band and millimeter wave superposition, and in the short-wave infrared period of overlap. Electromagnetic radiation within the three bands, including the generation of coherent radiation, transmission and receiving the content is very rich, especially versatile research field. On the study of infrared and millimeter wave has quite a history, and with the aviation, aerospace, remote sensing, remote control, early warning, monitoring and a series of important technical application of the national economy and people's livelihood is closely related to. Due to the lack of effective generation and detection methods, international study of terahertz only 20 years of history, people understanding of the nature of the band of the electromagnetic radiation is very limited, so that the band is called terahertz gap in the electromagnetic spectrum. Scientists have reached a consensus: terahertz is a kind of new, there are a lot of unique advantages of radiation sources, but it is also an important part of the cross frontier. Although the use of terahertz developed product is very limited, but it can be expected is the future world will be huge resources to develop terahertz technology. THZ terahertz promising application prospect, and will bring revolutionary change to multiple areas. At present, has been put into experimental use instead of X-ray safety testing. According to the Shanghai institute of technology and physics, Chinese Academy of Sciences Lu Wei researcher, relative to the infrared, terahertz wavelength is longer, also more to the permeability of the object. Space shuttle Columbia was lost along with the United States in 2003, scientists from NASA to provide a piece of material, using terahertz detection. There are more than 90 defects in the material is harmful to the safety, they detect the most, miss rate is only a few percent, more than the other detection methods. Some airports in the United States has been in use for terahertz safety inspection, not only from the form, but also accurate resolution from the chemical composition of explosives. At the same time, can 'see' the terahertz radio telescopes have also been used in our country. Shen Xue member of development, said the naked eye can observe launch - 450 750 nm wavelength of visible light objects, but these objects only a small fraction of the total, and other celestial bodies in glowing, but it is invisible to the naked eye of ir, terahertz and millimeter wave. Wide band radio telescope will help scientists observed the invisible light, thus learn more object information. Terahertz is another possible use plan participates in the international nuclear fusion reactor. Shen Xue interacting member tells a reporter, from a single photon, THZ energy is low, only one percent of visible light. But once the terahertz gathered together, form a high-energy cluster, which emit a pulse of energy can be up to several hundred megawatts, can be heated for nuclear fusion reactors. To build an efficient, stable and powerful terahertz generator is one of the scientists research priorities.