非经典电磁边界条件解析处理的中等尺度等离激元波导微扰理论
Perturbation theory of mesoscale plasmonic waveguide with an analytical treatment of nonclassical electromagnetic boundary condition
AI总结：
本文针对中等尺度等离激元波导，提出基于经典波导模式为基函数、非经典电磁边界条件为一阶微扰的非经典波导模式微扰理论，推导得到传播常数的解析表达式，为相关器件设计和参数测量提供有效工具。
AI中文摘要：
中等尺度等离激元波导（MPWs）的光学模式会受到非经典量子效应的显著影响，这类效应可通过结合表面响应费贝尔曼d参数（Feibelman d-parameters）构建的非经典电磁边界条件（NEBC）全面描述。本文提出了一种NEBC下MPWs所支持的非经典波导模式（NWMs）的微扰理论。该理论采用经典电磁边界条件（CEBC）下的经典波导模式（CWMs）作为基函数，将NEBC视为一阶微扰，推导得到了NWMs传播常数的解析表达式，该表达式与NEBC存在依赖关系。此理论清晰揭示了非经典效应与NWMs传播特性之间的潜在普遍关系，为理解和设计MPW器件，以及实验测量d参数提供了有效工具。
英文摘要：
The optical modes of mesoscale plasmonic waveguides (MPWs) are significantly affected by nonclassical quantum effects, which can be comprehensively described by the nonclassical electromagnetic boundary condition (NEBC) formulated with the surface-response Feibelman d-parameters. In this paper, a perturbation theory for the nonclassical waveguide modes (NWMs) supported by MPWs under the NEBC is proposed. In this theory, by adopting the classical waveguide modes (CWMs) under the classical electromagnetic boundary condition (CEBC) as the basis functions and treating the NEBC as a first-order perturbation, a general expression of the propagation constant of the NWM with an analytical dependence on the NEBC is derived. This theory transparently reveals the underlying general relation between the nonclassical effects and the propagation properties of the NWMs, thereby providing an effective tool for the understanding and design of MPW devices, as well as for the experimental measurement of the d-parameters.
