Purpose

The coupling characteristics between adjacent circuits are crucial for their efficient design in terms of electromagnetic compatibility features. Specifically, either the wireless power transfer can be enhanced or the interference can be limited. This paper aims to the extraction of the coupling characteristics of surface plasmon polariton waves propagating onto graphene layers to facilitate the telecommunication system design for advanced THz applications.

Design/methodology/approach

The surface conductivity of graphene is described at the far-infrared spectrum and modelled accurately by means of a properly modified finite-difference time-domain) scheme. Then, a series of numerical simulations for different coupling setups is conducted to extract an accurate generalised parametric coupling model that is dependent explicitly on the fundamental propagation features of graphene.

Findings

The coupling coefficients of two basic waveguiding setups are examined thoroughly. The initial one includes two parallel graphene layers of infinite dimensions, and it is observed that the coupling is influenced via the ratio between their distances to the confinement of the surface wave. The second scenario is composed of graphene microstrips that are parallel to their small edge, namely, microstrip width. The extracted numerical results indicate that the coupling coefficient depends on the ratio between widths to wavelength.

Originality/value

The accurate extraction of the generalised coupling coefficients for graphene surface wave circuits is conducted in this work via an adjustable numerical technique for a novel family of plasmonic couplers. It is derived that only the fundamental propagation features of graphene, such as the wavelength and the confinement of the surface waves, have an effect on the coupling calculation, thus enabling a consistent electromagnetic compatibility study.

中文翻译：

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太赫兹应用中高效石墨烯等离子体耦合电路的设计

目的

就电磁兼容性特性而言，相邻电路之间的耦合特性对其有效设计至关重要。具体地，可以增强无线电力传输或可以限制干扰。本文旨在提取传播到石墨烯层上的表面等离振子极化波的耦合特性，以促进高级THz应用的电信系统设计。

设计/方法/方法

石墨烯的表面电导率在远红外光谱处描述，并通过适当修改的有限差分时域方案进行精确建模。然后，针对不同的耦合设置进行了一系列数值模拟，以提取精确的广义参数耦合模型，该模型明确依赖于石墨烯的基本传播特征。

发现

彻底检查了两种基本波导设置的耦合系数。最初的层包括两个平行的无限尺寸的石墨烯层，并且观察到耦合是通过它们的距离与表面波限制之间的比率来影响的。第二种情况由平行于其小边缘即微带宽度的石墨烯微带组成。提取的数值结果表明，耦合系数取决于宽度与波长之间的比率。

创意/价值

在这项工作中，通过一种适用于新型等离激元耦合器的可调数值技术，对石墨烯表面波电路的广义耦合系数进行了精确提取。得出的结论是，只有石墨烯的基本传播特征（例如波长和表面波的限制）会影响耦合计算，因此可以进行一致的电磁兼容性研究。