Experimental And Theoretical Study On Terahertz Source And Terahertz Waveguide

Terahertz usually refers to the electromagnetic wave with frequency in the0.1～10THz, which belongs to the far infrared and submillimeter wave category. The long wave direction is the traditional electromagnetic field, and the shortwave direction is the optical field. This means that this particular band has both of the characteristics of microwave and infrared wave, and at the same time terahertz has some characteristics which microwave and infrared do not have, therefore it plays a complementary role. These characteristics decided terahertz technology has great scientific value and wide application prospect in imaging, medical diagnosis, environmental monitoring, radio astronomy, broadband mobile communications, satellite communications and military radar.Firstly, this part introduces the introduction of terahertz wave features, generating method, detection method and terahertz applications in various fields.Secondly, we establish a photoconductive antenna for generating terahertz wave current transient impulse model from the physical mechanism of photoconductive antenna for generating terahertz wave, summed up the impact of photoconductive antenna to generate a terahertz wave power factor. Summary the photoconductive switch two kinds of work modes.Thirdly, we design experiment of a photoconductive antenna for generating terahertz wave, studied the laser pumping power and the applied bias voltage on the photoconductive antenna to generate THz wave power influence.Finally, combination of THz technology and photonic crystal fiber, we presented a novel plastic photonic crystal terahertz waveguides, which randomly distributed pores photonic crystal terahertz waveguides. The waveguide substrate material is polytetrafluoroethylene, polyethylene core material selection, modeling after using the COMSOL software to carry on the numerical simulation, on the waveguide birefringence, dispersion, loss and the effective mode field area and other parameters, for its future application and provide a theoretical basis.