【摘要】 基于表面等离子体波产生的物理机理和其新颖特性,设计出能够激发太赫兹表面等离子体波的两种圆柱体周期性光栅结构模型。通过研究周期性阵列结构中表面等离子体波的色散关系,理论预测了表面等离子体波的共振频率,并在仿真实验结果中得到验证。通过观察表面等离子波电场的变化,结合理论详细分析了界面处表面波随各因素的变化规律。研究结果表明,垂直结构的碳纳米管束半径为24μm,栅周期为95μm时,激发的表面等离子波最强;而对于水平结构,半径为25μm,栅周期为120μm时,所激发表面等离子波最强。其研究结果对利用等离子波探测THz信号和THz传感器的设计有重要指导意义。更多还原

【Abstract】 The physical mechanism of the surface plasmon polaritons was analyzed based on the electromagnetic theory of generating the surface plasma wave. Two periodic cylinder grating structure models were designed. By studying the dispersion relation of surface plasma wave in periodic array structure,the surface plasma wave resonance frequencies were predicted in theory,and tested in the simulation experiment results. Observing the change laws of SPPs electric field simulation,and combining with the theoretical analysis of the SPPs relations along with the change of various factors,all the parameters were optimized,and its transmission characteristics were studied. The results show that the electric field reaches the maximum value at r =24 μm and a =95 μm for vertical structure,at r =25 μm and a =120 μm for horizontal structure. This paper provides an important guide for detection of THz signal and design of THz sensor.更多还原