National Defense University College of quantum computing researchers conducted laboratory tests terahertz generation
Spear and shield strength has always been the shift, or terahertz radar stealth aircraft will become a 'new nemesis'
http://www.best-news.us/news-4536892-Terahertz:-From-the-forgotten-to-is-sticky.html
In recent years, there is a technique by the United States as 'change the future of the world's top ten technology,' one of the Japanese as a 'national pillar ten key strategic objectives,' the first, that is, terahertz technology refers to terahertz frequencies 0.1 to 10 THz band of electromagnetic waves, in the macroscopic to microscopic quantum theory of the classical theory, electronics to photonics transition region. frequency which is higher than the microwave, infrared lower energy electrons and photons in size between. Because of this transition zone crossing, neither perfectly suited to deal with the optical theory is not entirely suitable for microwave theory to study, so before the nineties of last century, once was 'forgotten', also known as the 'too Hertz blank. 'At present, countries have accelerated for this unique band did not receive sufficient research to explore, set off a wave of terahertz research, then, as a fifth-dimensional battle space' to expand those 'in the military field terahertz specific What are the applications? let us approached closer look.
Terahertz Imaging
Distance through walls, created new weapon fighting terrorism
If you ask what is most afraid of U.S. troops in Iraq, then the answer is definitely a roadside bomb, hard to detect roadside bombs, U.S. troops in Iraq became a shudder of the 'number one killer', that it makes the U.S. Marine Corps commander Haji Michael said: 'This relatively low-level weapons will become a sign of future wars.' Before the Americans leave Iraq casualties caused by roadside bombs was heard at the same time, constantly occurring bacteria mail, parcel bombs and suicide attacks also makes human nerves. seems to threaten the traditional front, high-tech can not do anything, the fact that really so? terahertz wall clairvoyant might be able to reverse the passive situation.
Terahertz frequency is high, short wavelength spectrum with high signal to noise ratio in time domain, and in the smoke, dust environments transmission loss rarely, can penetrate the wall of housing internal scan complex battlefield environment to find the ideal enemy imaging technology and the fight against terrorism in the city of the future, with too Hezi Te some of the 'wall art' can be of the 'wall' objects three-dimensional imaging to detect concealed weapons, camouflage and armed ambush Show dust or smoke in the tanks, artillery and other equipment, then poke the battlefield fog.
In addition, terahertz imaging technology in the plastic weapon, ceramic pistol, plastic explosives, liquid explosives and bomb detection and identification of the body, the more is the 'perspicacious', the use of terahertz radiation pavement, you can also detect underground minefields distance Distribution of this, the soldiers do not need to close the lot or suspicious persons can be checked with the higher cost, the role of shorter distances, can not identify the specific explosives compared to X-ray scanners, terahertz imaging has the unique advantage , has been initially applied to check mail, identify explosives and nondestructive testing and other security areas.
Terahertz Radar
Precision wideband, so stealth weapons to escape detection
As we all know, the radar target mainly by receiving the reflected signal to find the target if the target surface can be absorbed or scattered radar, you can greatly reduce the probability of discovery, so as to achieve the purpose of stealth so-called stealth technology mainly by the shape, absorbing coating to form a plasma cloud absorb or change the direction of propagation of radar waves to achieve stealth.
After the application of stealth technology, the conventional narrowband microwave radar detection radar cross-section in a small stealth weapon often seem 'powerless.' So, for a long period of time, people are talking about 'hidden' pale, but also the current stealth technology not perfect, they can only be on a very narrow band played a particular role, beyond the scope of this particular post will be powerless.
The transition zone in the electromagnetic spectrum is the terahertz longer a collection of many excellent one hand, its wavelength is short, about the range of 30um-3mm, far less than the wavelength of the microwave and millimeter wave, and therefore can be used for detecting smaller targets and more precise positioning, on the other, but it contains a wealth of frequency, has a very wide bandwidth, capable of transmitting frequencies nanosecond or even thousands of picosecond pulses, much higher than now There stealth technology scope, therefore, whether it is face shape stealth, stealth paint, or plasma stealth target, so that they can be 'nowhere to hide'! The United States is the first to propose the concept of terahertz radar countries, and has carried out 0.2THz, 1.56THz, 0.6THz and other high-resolution radar experiment to test the feasibility of terahertz radar for future development has laid a foundation. Too Hertz radar as a future high-precision, anti-stealth radar direction of development, in the military setting will have broad application prospects.
Terahertz Communications
Short is also a good short and open up new areas of tactical communications
In the development of wireless communication over a hundred years later, the military communications field 500MHz ~ 5GHz band has become increasingly scarce resources, although worthy of future quantum communication technology vision, but is still somewhat distant, while terahertz this had been 'forgotten' band, integrated microwave communication and optical communication advantages, with high transmission speed, large capacity, strong direction, safe and penetrating well, and many other features, the military communication applications on enticing, has become a national mining the development of hot spots.
First, the terahertz frequency band to be higher than the existing microwave communications l ~ 4 orders of magnitude, which means that it can carry a greater amount of information, easy to solve the current battlefield information transfer is subject to the bandwidth problem, meet large data transfers rate communications requirements .2012 Tokyo Institute of Technology predicted terahertz communications technologies for wireless data transmission speed, in theory, can be up to 100 Gigabit per second, and we have good reason to believe that the future use of terahertz wireless HD video transmission information, perhaps only in the short span. Secondly, the terahertz beam is narrower, with a high directivity, better confidentiality, strong anti-interference and ability to penetrate clouds and camouflage, you can wind, dust and the smoke of the battlefield and other harsh environments with high bandwidth directional, high security and even military communications codes.
Currently, the communication distance alone, due to terahertz spread through the air when water is easily absorbed, signal attenuation serious, there is also a shorter distance of the 'short board.' But as the saying goes, 'there are short short good ', in some cases, in view of the confusion and battlefield communications channel congestion, the transmission distance limited but can be advantage because atmospheric attenuation of the signal can not be simply spread to distant monitoring mechanism enemy radio technology, can be achieved covert short-range communication. According to relevant media reports, the U.S. is using terahertz transmission distance is relatively short, can not easily be intercepted advantage to develop a communication distance of about 5 km from close range tactical communications equipment, once the application is bound to lead to electromagnetic space and a confrontation.
Photo courtesy: HE Shu-yuan
Zhong Baolin Zhou Yang Sheng Rui
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