This work considers the near-infrared range diffraction radiation (DR) from a modulated beam of particles passing between two identical dielectric circular nanowires covered with graphene. The resistive boundary conditions are set on the zero-thickness graphene covers with the electron conductivity determined from the Kubo formalism. Assuming that the beam velocity is fixed, we use the separation of variables in local coordinates and the addition theorems for cylindrical functions and cast the DR problem to a Fredholm second-kind matrix equation. This allows us to compute both near- and far-field characteristics with controlled accuracy. The analysis reveals that a shift of the beam trajectory from the central-symmetric position enables the excitation of additional resonances on the modes, which remain “dark” otherwise. Ignition of these resonances can be considered as a tool for noninvasive beam position monitoring with microscale devices.

中文翻译：

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来自石墨烯覆盖的双圆形介质棒的红外衍射辐射：等离子体共振和光束位置传感

这项工作考虑了来自调制的粒子束的近红外范围衍射辐射 (DR)，该束通过在覆盖有石墨烯的两条相同的介电圆形纳米线之间传递。电阻边界条件设置在零厚度石墨烯覆盖层上，电子电导率由 Kubo 形式主义确定。假设光束速度是固定的，我们使用局部坐标中变量的分离和柱函数的加法定理，并将 DR 问题转换为 Fredholm 第二类矩阵方程。这使我们能够以可控的精度计算近场和远场特性。分析表明，光束轨迹从中心对称位置的偏移能够激发模式上的额外共振，否则这些模式保持“暗”。