New website getting online, testing
    • 摘要: 本文提出了一种基于空间填充曲线的超构表面结构,利用理论分析、数值仿真的方法研究了该超构表面的近场电磁特性,实现了高度局域及高品质因子(Q-factor)的多阶人工局域表面等离激元共振(spoof plasmon resonances)。我们发现采用不同结构形状和尺寸的空间填充曲线均可产生共振频率规则分布的多阶谐振模式,通过调整结构的等效波导长度,可同时获得高的谐振波长/结构尺寸压缩比与高品质因子。空间填充曲线所支持的人工局域表面等离激元由磁偶极子与电偶极子模式交替支持;其余参数不变的情况下改变空间填充曲线的分布形式,结构所支持的表面等离激元的谐振特性不受形状曲折的影响,而只与等效波导总长度有关。此外,近场模式的强度分布随着空气波导的走向而改变,可根据实际需求对结构进行特定排布。本文的研究结果对设计基于空间填充曲线的小型化高品质因子电磁谐振器件具有重要的指导意义。

       

      Abstract: With the advent of the 5G communication era, much attention has been paid to manipulate electromagnetic waves at subwavelength scale. In this paper, we propose comb-shaped meta-structures based on space-filling curves, and use theoretical analysis and numerical simulation method to study the near-field electromagnetic properties of these meta-surfaces. Finally, the effective excitation of all order eigenmodes of spoof localized surface plasmon resonance can be realized in these meta-structures. Through adjusting the structure period to change the effective length of the air waveguide, high compression ratio between resonant wavelength and device size, and high Q-factor can be simultaneously achieved. Moreover, spoof localized surface plasmons excited by space-filling structures are alternately supported by magnetic dipole and electric dipole modes. As a consequence, changing the distribution form of the space-filling curve with the remaining parameters unchanged, the resonant characteristics of the surface plasmon supported by the structure are not affected by the shape tortuosity, but are only related to the total length of the equivalent waveguide. Thus, the space-filling curvilinear structure can be freely designed. We believe that, our results have great potential in designing the high Q-factor miniaturized electromagnetic resonator devices based on spacing-filling curvilinear meta-structure.