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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 properties of THz thin-walled carbon nanotubes (CNTs) films, the propagation and localization of surface plasmon polaritons in a thin-film carbon nanotube thin film gate-period structure were studied by using the numerical THz time-domain spectroscopy technique. The results show that, At the gate period of 168μm, the resonant peaks of two plasmon modes appeared at frequencies of 0.5-2.5THz, which were at 0.99THz and 1.95THz, respectively, which agrees well with the theoretical results. The calculated surface plasmon propagation distances were The theoretical predictions are in agreement with each other, reaching 146μm.In addition, the influence of gate thickness and gate width on the surface plasmon characteristics is analyzed.