This paper presents a novel analytical model for chiral multi-layer waveguides incorporating graphene sheets. The general structure is composed of various chiral layers, where a graphene sheet has been sandwiched between two adjacent chiral layers. We have chosen and studied this general structure to suggest a new platform for novel emerging sciences such as optical sensing. An analytical model has been proposed for the general structure to find its dispersion relation and other modal properties such as the effective index and the propagation length. To show the richness of our general structure, two novel chiral waveguides containing graphene sheets have been introduced and investigated. Our analytical results show that high values of effective indices, e.g. ${{{\bf n}}_{{{\bf eff}}}} = \ 15$ at the frequency of 8 THz for the second structure, is achievable. Moreover, it has been shown that the chemical potential of the graphene and the chirality can adjust and control the plasmonic features. Our multi-layer structure and its analytical model can be utilized in several potential applications such as switches, absorbers, cloaks, polarization rotators, and directional couplers in the THz frequencies.

中文翻译：

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用于太赫兹应用的含有石墨烯片的手性多层结构的分析研究

本文提出了一种包含石墨烯片的手性多层波导的新型分析模型。一般结构由各种手性层组成，其中石墨烯片夹在两个相邻的手性层之间。我们选择并研究了这种一般结构，为光学传感等新兴科学提出了一个新平台。已经为一般结构提出了一种解析模型，以找到其色散关系和其他模态特性，例如有效指数和传播长度。为了展示我们一般结构的丰富性，我们引入并研究了两种包含石墨烯片的新型手性波导。我们的分析结果表明，对于第二个结构，在 8 THz 频率下，有效指数的高值，例如 ${{{\bf n}}_{{{\bf eff}}}} = \ 15$，是可以实现的。此外，已经表明石墨烯的化学势和手性可以调节和控制等离子体特征。我们的多层结构及其分析模型可用于多种潜在应用，例如太赫兹频率的开关、吸收器、斗篷、偏振旋转器和定向耦合器。