碳纳米管薄膜周期结构的太赫兹表面等离子波特性研究

Properties of terahertz surface plasmon ploaritons on carbon nanotube film with periodic grating

在获得太赫兹波段碳纳米管薄膜的介电特性基础上,利用数值THz时域光谱技术研究了碳纳米管薄膜栅周期结构的表面等离子激元的传播特性和局域化现象.研究结果表明,在栅周期为168μm时,频率在0.5—2.5THz之间出现两个等离子模式的共振峰值,分别位于0.99THz和1.95THz,这与理论计算结果相符合.数值计算的表面等离子激元传播距离与理论预测值相一致,达到了146μm.此外,分析了栅厚度与栅宽度变化对表面等离子波特性的影响.

Based on the dielectric property of carbon nanotube film,the surface plasmon ploariton propagation and localization phenomena on the carbon nanotube film are investigated using THz time-domain spectroscopy technique.The simulation results show that in the gate period of 168um,the resonance peaks of surface plasmon mode are at 0.99THz and 1.95 THz,which are consistent with the theoretical results.Further analysis demonstrates that both the gate thickness and the width have an important effect on the properties of surface plasmon ploaritons.