Study on the performance of the raised-cosine structure with relative low index dielectric regions surface plasmon polaritons waveguides
首发时间:2015-04-16
Abstract:In this paper, A novel raised-cosine structure with relative low index dielectric regions surface plasmon polaritons(SPPs) waveguide is proposed. In the waveguide, the raised-cosine structure is introduced to the waveguide's dielectric regions innovatively. Then the field distribution, the normalized mode area, the propagation length and the figures of merit are calculated at the telecom wavelength of =1550nm. The relationship between the waveguide's performance and the shape of waveguide's relative low index dielectric regions(RLIDRs) is also discussed. It is found that the proposed waveguide had the longer propagation length than the conventional rectangle RLIDRs SPPs waveguide and it also has a strong capability of the field confinement. Moreover, with the change of the roll factor of the RLIDRs, the proposed waveguide's performance doesn't change greatly, when the between 0.02 and 0.2, its performance almost has no change. That means the machining error has a negligible impact on the waveguide's performance and it will have a greater potential in the application. All the simulations in this paper were performed by using rigorous numerical schemes based on finite-element method (FEM).
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具有低折射率介质层的升余弦结构表面等离子激元波导特性研究
摘要:本文提出了一种嵌入低折射率介质层的升余弦结构表面等离子激元波导。在这种波导结构中,升余弦结构被创新地引入到波导介质层中。在通信波长1550nm处,运用有限元法数值仿真分析了该新型波导结构的场分布,归一化模式面积,传播长度以及品质因数。另外,在文中还讨论了波导性能与低折射率介质层外形的关系。通过研究发现,相对于传统的矩形低折射率介质层波导,文中提出的新型波导不仅拥有很强的模场限制能力,而且传播长度更长。此外,通过改变波导中低折射率介质层的滚降因子来改变波导的形状,发现这种新型波导的各项性能变化不大,尤其当滚降因子位于0.02至0.2之间时,波导的性能几乎没有发生改变。这说明在此区间加工误差对于这种新型波导性能的影响很小。因此,该新型升余弦结构低折射率介质层波导具有良好的应用前景
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No.4637809104896914****
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