基于欺骗表面等离子体操控的双功能Luneburg-fisheye透镜
Bifunctional Luneburg-fisheye Lens Based on the Manipulation of Spoof Surface Plasmons
摘要：
操纵欺骗表面等离子体激元（SSP）最近引起了极大的兴趣，由于能够引导波与亚波长的脚步。然而，以往的研究大多表现为单一的功能，不适合多功能集成设备。本文提出了一种基于二维金属柱阵列的双功能Luneburg-fisheye透镜。首先，通过调整阵列中金属柱的几何尺寸，证实了其沿一个方向精确操纵激发的SSP的能力，实现了分辨率高达0.14倍波长的亚波长聚焦和成像。然后，分别控制各向异性透镜的传播，实现了双功能Luneburg-fisheye透镜。双功能透镜的特征在于沿x轴的Luneburg透镜，而在y轴上，它呈现Maxwell鱼眼透镜的性质。实验结果与仿真结果几乎完全吻合。这种双功能透镜可以有效地降低系统的复杂性，并在多功能应用中发挥灵活性，而所提出的基于金属柱的设计方法拓宽了梯度折射率透镜在微波、太赫兹甚至光学范围的应用范围。
英文摘要：
Manipulation of spoof surface plasmons (SSPs) has recently intrigued enormous interest due to the capability of guiding waves with subwavelength footsteps. However, most of the previous studies, manifested for a single functionality, are not suitable for multifunctional integrated devices. Herein, a bifunctional Luneburg-fisheye lens is proposed based on a two-dimension metal pillar array. Firstly, by tuning the geometric dimension of the metal pillars in the array, its ability to precisely manipulate the excited SSPs along one direction is confirmed, achieving subwavelength focusing and imaging with the resolution up to 0.14 times the wavelength. Then, separately controlling the propagation of the SSPs along the orthotropic directions is further implemented, and the bifunctional Luneburg-fisheye lens is realized. The bifunctional lens is characterized as a Luneburg one along the x-axis, whereas in the y-axis, it presents the properties of a Maxwell fisheye lens. The experimental results almost immaculately match with the simulation ones. This bifunctional lens can validly reduce the system complexity and exert flexibility in multifunctional applications, while the proposed metal pillar-based design method broadens the application range of gradient refractive-index lens in the microwaves, terahertz, and even optical ranges.
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