基于石墨烯的光泵浦太赫兹光谱-光电信息工程专业论文.docx

华中科技大学硕士学位论文 华 中 科 技 大 学 硕 士 学 位 论 文 II II Abstract In recent years, the science and technology of terahertz get great attention and extensive research in the world, and it has achieved remarkable results. Terahertz waves enjoy many prospective applications in medical imaging, material testing, environmental monitoring, mobile communications, satellite communication and military radar. However, due to the limited knowledge of source materials for terahertz devices, the advancement of terahertz technology has progressed more slowly than most other electromagnetic technology, therefore very important to continue to study materials for the manufacturing of terahertz devices. For example, graphene is a two dimensional material with excellent crystal quality and electronic properties, with the highest temperature-independent mobility of all known materials as thus far. The fluctuation of carrier density in graphene heterogeneous structure will cause the changes of resistivity in the graphene, and these changes can be used to change the transmission rate of terahertz waves in graphene devices. The combining of graphene and terahertz technology provides a new idea for terahertz device design. This work is mainly about optical pumping terahertz spectroscopy based on the grapheme. This thesis is built around the interaction between terahertz wave and graphene on silicon. Firstly, the background knowledge about terahertz wave and graphene is introduced. Then we introduce the preparation technology and characterization technology of graphene. In the third part, we introduce the Terahertz Time-Domain Spectroscopy method we used, and the experimental instrument. The experimental results and analysis including time domain waveform, frequency domain spectrum, transmittance spectrum, conductivity spectrum, resistivity spectrum of graphene and acoustic phonon model are depicted. Finally, the prospect of this research and potential impedences are mentioned in this thesis. Keywords: T