In this paper, we show that graphene-coated nanowire integrated with a semi-elliptical dielectric substrate could enable excellent subwavelength transmission performance in the mid-infrared range. The fundamental graphene plasmon mode behaviors on the thickness of silica layer, ratio of long- to short-axis of the ellipse, nanowire radius, and chemical potential of graphene are revealed in detail. By improving the geometric parameters and the surface conductivity of graphene, results show that deep-subwavelength modal field size and long propagation could be achieved. Our findings may promote the applications of graphene-coated nanowires in tunable nanoscale photonic devices and sensors.

中文翻译：

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石墨烯涂层纳米线与基板集成的模态特性研究

在本文中，我们展示了与半椭圆电介质基板集成的石墨烯涂层纳米线可以在中红外范围内实现出色的亚波长传输性能。详细揭示了二氧化硅层厚度、椭圆长短轴比、纳米线半径和石墨烯化学势的基本石墨烯等离子体模式行为。通过改善石墨烯的几何参数和表面电导率，结果表明可以实现深亚波长模场大小和长传播。我们的发现可能会促进石墨烯涂层纳米线在可调谐纳米级光子器件和传感器中的应用。