高阶局域欺骗表面等离子体共振及其实验验证
High-order localized spoof surface plasmon resonances and experimental verifications
摘要：
我们从理论上证明和实验上验证了由织构金属颗粒支持的高阶径向欺骗局域表面等离子共振。通过有效介质理论和精确的数值模拟，我们显示了这些几何起源的电磁模式在微波频率的出现。实验验证了在非线性介质中高阶径向欺骗等离子体共振的发生。它们的光谱和近场特性的实验，其特征在于与理论预测显示出良好的协议。我们的研究结果揭示了欺骗局部表面等离子体激元的性质，并开辟了宽带等离子体激元器件的设计，能够在非常不同的频率制度。
英文摘要：
We theoretically demonstrated and experimentally verified high-order radial spoof localized surface plasmon resonances supported by textured metal particles. Through an effective medium theory and exact numerical simulations, we show the emergence of these geometrically-originated electromagnetic modes at microwave frequencies. The occurrence of high-order radial spoof plasmon resonances is experimentally verified in ultrathin disks. Their spectral and near-field properties are characterized experimentally, showing an excellent agreement with theoretical predictions. Our findings shed light into the nature of spoof localized surface plasmons, and open the way to the design of broadband plasmonic devices able to operate at very different frequency regimes.
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