Research Of Terahertz Functional Components Based On Metal Surface Plasmon Polaritons And Photonic Crystal

Compared with the rapid development of terahertz (THz) sources and detectors, the THz components are developed relatively slowly. It can be found that the researches of many components merely stay in the design stage. A few samples have been fabricated, while their measured characteristics are not good enough or the fabrication technologies are too complicated to be widely utilized. Therefore, the THz components need to be further developed to promote the researches and applications of THz science and technology.Metal surface plasmon polaritons (SPPs) has enhanced transmission effect. By designing the structure parameters of metal sub-wavelength array, the enhancement of transmission at special frequencies and attenuation of transmission at other frequency band can be realized. In addition, metal SPPs can break diffraction limit and restrict the electromagnetic (EM) waves to be transmitted at sub-wavelength scale. It has many important applications in sub-wavelength optics, nanotechnology and new-type light-source etc. Photonic crystal (PC) can effectively manipulate EM waves and the space scale of PC is comparable with the operating wavelength. By introducing the researches of PC into THz regime can greatly promote the development of THz components. Based on metal SPPs and photonic crystal, some functional components at THz regime are studied in this thesis. The main innovative points are as follows.(1) The metal-dielectric-metal sub-wavelength array with periodic air holes is analyzed theoretically. A method has been established through experimental verification and simulation design of this structure. It is verified that this kind of structure can realized THz wideband filtering functionality by theoretical analysis, simulation design and preliminary experiment.(2) We optimized design the structure parameters and fabricate metal-air-metal samples with square lattice, circular air holes, sub-wavelength array. A THz wideband filter with center frequency locating at 0.8 THz and bandwidth reaching 400 GHz is experimentally achieved, which is in agreement with theoretical analysis and simulation results. (3) We optimized design the structure parameters and fabricate photonic crystal slab sample with triangular lattice, circular air holes array on the high-resistivity silicon slab. Experimental results show that in the photonic bandgap in frequencies ranging from 0.254 THz to 0.33 THz, there is a high transmittance of the photonic crystal slab waveguide sample in frequencies ranging from 0.26 to 0.268 THz, which is in agreement with theoretical analysis and simulation results.