Thz Waves Theory Simulation And Testing Experiment Research

Terahertz (THz) radiation lies between infrared and microwave, and its frequencyis generally in the range of0.1THz to10THz. Due to the important properties ofTHz radiations, such as its transmitting many kinds of dielectric and gaseousmaterials which have plenty of properties in absorbing and dispersing THz radiation,the components and the information of physics, chemistry and biology of a samplecan be gotten by detecting and analyzing THz signal having transmitted the sample.THz imaging and its spectral technology can reveal the information that conventionalmicrowave and X-ray can not. There are many applications including high rate datacommunication, secret communication, precise control and guide and securityexamination and so on for THz radiation. Therefore, the new researches, thegeneration and detection of THz and THz application, are attracting more and morescientists’ attention all over the world recently.There are two main sorts of generating THz radiation. One is the broadband THzgeneration including generating THz from photoconductive effect, semiconductorsurfaces, optical rectification and nonlinear transmission lines etc. The other is thegeneration of the narrowband THz radiation, photomixing, optical parametricconversion and THz semiconductor laser have been invented for this way. At thesame time, there are some methods for detecting THz radiation, and among them freespace electro-optical sampling (FS-EOS) and photoconductive antenna sampling aretwo main techniques.The main work of this thesis is as following:By analyzing of the biased electric field distribution on the traditionalphotoconductive antennas, which were usually used as the emitters for THz radiation,this thesis knew about their disadvantages, analyzed the reasons and designed aspecial structure of photoconductive antenna which can be biased higher voltage efficiently and safely than the traditional emitters at last; Also, this thesis designedand produced a balanced photoelectric differential detector by designing, making andoptimizing its circuit. Our detector can take place of the imported detector in freespace electro-optic sampling (FS-EOS), and it has a higher ratio of performance tocost than the imported one.