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首页> 美国卫生研究院文献>Scientific Reports >Properties of Transmission and Leaky Modes in a Plasmonic Waveguide Constructed by Periodic Subwavelength Metallic Hollow Blocks
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Properties of Transmission and Leaky Modes in a Plasmonic Waveguide Constructed by Periodic Subwavelength Metallic Hollow Blocks

机译：周期性亚波长金属空心块构成的等离子波导管的传输和泄漏模的性质

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摘要

Based on the concept of low-frequency spoof surface plasmon polaritons (spoof SPPs), a kind of leaky mode is proposed in a waveguide made of a subwavelength metal-block array with open slots. Numerical results reveal that a new transmission mode is found in the periodic subwavelength metal open blocks. This modal field is located inside the interior of a hollow block compared with that in a solid metal block array. The dispersion curve shows that such a new SPPs mode has a negative slope, crossing the light line, and then going into a zone of leaky mode at higher frequencies. The leaky mode has a wider frequency bandwidth, and this can lead to a radiation scanning angle of 53° together with high radiation efficiency. Based on the individual characteristics exhibited by a frequency-dependent radiation pattern for the present leaky mode, the waveguide structure can have potential applications such as frequency dividers and demultiplexers. Experimental verification of such a leaky mode at microwave has been performed, and the experimental results are found to be consistent with the theoretical analysis.
机译：基于低频欺骗表面等离子体激元（spoof SPPs）的概念，提出了一种在具有开口缝隙的亚波长金属块阵列制成的波导中的泄漏模式。数值结果表明，在周期性亚波长金属开放块中发现了一种新的传输模式。与固态金属块阵列相比，该模态场位于空心块的内部。色散曲线表明，这种新的SPPs模式具有负斜率，越过灯光线，然后以较高的频率进入泄漏模式区域。泄漏模式具有较宽的频率带宽，这可以导致53°的辐射扫描角以及较高的辐射效率。基于当前泄漏模式的频率相关辐射图所展现的各个特性，波导结构可以具有潜在的应用，例如分频器和解复用器。已经进行了这种泄漏模式在微波的实验验证，并且实验结果与理论分析一致。

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