Design,Experimental Observation And Characteristic Simulation Of Terahertz Optics

Due to its unique advantages,THz has attracted much attention in various research fields.As the core elements for the development of terahertz science and technology,THz optics has very important research significance and practical application value.In this thesis,the optical properties of THz optics are simulated by using 3D electromagnetic simulation software CST.The concave lens and Spiral Phase Spheres are prepared by 3D printing technology and experimentally observed.It proves that 3D printing technology has a good application prospect in the fabrication of THz optics.The research consists:(1)Firstly,CST is briefly introduced.THz RCS of complex targets are simulated by co-MATLAB-CST to verify the effectiveness,correctness and convenience of 3D electromagnetic field simulation by this method.It provides a convenient and efficient research method for the subsequent study of optical characteristics simulation of THz optics.The basic principle of 3D printing technology is explained,which makes it possible to fabricate THz optical devices using 3D printing technology.(2)The biconcave lens was fabricated by 3D printing technology and used in the design of 0.1 THz collimating beam expanding system.CST simulation and experimental observations were carried out.Comparing simulations with experimental results,it displays that this system has a good beam expansion and collimation effect.(3)Based on the design principle of the Spiral Phase Sphere used generating the vortex beam,the co-MATLAB-CST simulation is used to design the THz Spiral Phase Spheres with different topological values.It was verified that the optics can be used to generate THz vortex beams.The Spiral Phase Spheres with different topological values were prepared by 3D printing technology.The Spiral Phase Sphere with topological value of 1 was experimentally observed.(4)The characteristic simulation of the optimized 0.65 THz silicon-based strip-sector-shaped patch antenna is carried out.The lens theory in THz band is introduced.The 3D printing material VeroWhite material is used as the material of the dielectric lens to design and optimize the extended hemispherical lens.The hemispherical lens is used to analyze the simulation characteristics of the 0.65 THz strip-sector-shaped patch integrated antenna.The radius and extended length of the extended hemispherical lens are optimized by simulation to make the antenna have better radiation characteristics.