多层结构中的等离激元—极化激元

发布时间：2018-07-02 15:24

本文选题：表面等离激元-极化激元 + 多层结构　；参考：《苏州科技学院》2015年硕士论文

【摘要】：表面等离激元-极化激元(Surface plasmon polaritons,SPPs)具有突破衍射极限、能量高度局域化等突出特性,对集成光学的发展发挥着越来越重要的作用。表面等离子体波导是SPPs的重要应用之一,已经引起了人们的广泛关注。基于电磁场的基本理论和流体动力学模型,研究了四层非对称结构中非局域效应对SPPs的影响。在考虑了金属的非局域效应之后,计算了四层非对称结构的色散关系,并对其传播特性进行研究。结果表明,在考虑非局域效应的情况下,SPPs与局域情况下的几乎具有相同的变化趋势;只有在波矢较大、频率较高或者聚合物层较厚时,非局域效应对SPPs的色散和传播特性的影响更加明显。石墨烯是一种新颖的等离子体材料,在太赫兹到中红外波段有潜在的应用前景。为此,利用麦克斯韦方程组,针对几种结构研究了石墨烯结构中的SPPs,讨论SPPs的色散关系和传播特性。结果表明,在讨论的几种结构中,SPPs的传播特性基本上是相似的。相比之下,对称结构比非对称结构更有利于SPPs的传播。利用减小频率或者增加费米能级等手段,可以有效地提高SPPs的传播长度。利用石墨烯费米能级的可调性,能够实现对SPPs色散和传播特性的调控。上述研究结果可能对于开发在纳米量级和亚纳米量级下工作的等离子体器件有一定帮助。
[Abstract]:Surface plasmon polaritons (SPPs) play an increasingly important role in the development of integrated optics because of their outstanding characteristics such as breaking through the diffraction limit and high energy localization. Surface plasma waveguide is one of the important applications of SPPs. Based on the basic theory of electromagnetic field and hydrodynamic model, the effects of non-local effects on SPPs in four-layer asymmetric structures are studied. After considering the nonlocal effect of metal, the dispersion relation of the four-layer asymmetric structure is calculated and its propagation characteristics are studied. The results show that the SPPs have almost the same trend when the nonlocal effect is considered, and only when the wave vector is larger, the frequency is higher or the polymer layer is thicker, The effect of nonlocal effects on the dispersion and propagation characteristics of SPPs is more obvious. Graphene is a novel plasma material, which has a potential application in terahertz to mid-infrared band. In this paper, we use Maxwell's equations to study SPPsin graphene structure for several structures, and discuss the dispersion relation and propagation characteristics of SPPs. The results show that the propagation characteristics of SPPs are basically similar in the several structures discussed. In contrast, symmetric structures are more conducive to the propagation of SPPs than asymmetric structures. The propagation length of SPPs can be effectively increased by decreasing the frequency or increasing the Fermi level. The dispersion and propagation characteristics of SPPs can be regulated by using the tunability of the Fermi level of graphene. These results may be helpful for the development of plasma devices working at nanometers and subnanometers.
【学位授予单位】：苏州科技学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN25

【相似文献】