A Mutual Coupling Theory for Arbitrarily Distributed Trimeric Localized Surface Plasmonic Particles
A Mutual Coupling Theory for Arbitrarily Distributed Trimeric Localized Surface Plasmonic Particles
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DOI：
10.1002/adpr.202200232
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发表时间：
2022-12
期刊：
影响因子：
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通讯作者：
Yu Chen;T. Fu;Ziquan Zhou;Daofan Wang;Zilan Deng;Ziqiang Yang;Y. An;Haiou Li
中科院分区：
文献类型：
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作者：
Yu Chen;T. Fu;Ziquan Zhou;Daofan Wang;Zilan Deng;Ziqiang Yang;Y. An;Haiou Li
耦合模理论（CMT）被广泛用于分析等离子体激元与超颖表面的耦合关系。然而，一些细节涉及耦合结构仍然模糊。本文对CMT中的系数进行了适当的定义，以解决从两个粒子到三个或更多粒子的拟合不准确的问题。提出的改进耦合模理论（i-CMT）可以很好地描述二聚体和三聚体互耦合系统的透射曲线的幅值和相位。制作了包含多个金属螺旋结构的表面等离子体结构，以实验验证i-CMT的准确性。实验结果与理论值和模拟值一致，证明了利用i-CMT分析和设计非对称耦合器件的可行性。此外，i-CMT的应用证实了在三个或更多耦合物体中存在额外的耦合项，使得本征频率的计算更加准确。
Coupled mode theory (CMT) is widely used to analyze the coupling relationship of plasmons and metasurfaces. However, some details involving coupled structures remain obscure. Herein, the coefficients in CMT are properly defined to solve the problems of inaccurate fitting from two particles to three or more. The proposed improved coupled mode theory (i‐CMT) can perfectly express both the amplitude and phase of transmission curve of dimeric and trimeric mutual coupled systems. A surface plasmonic structure containing multiple metallic spiral structures is fabricated to experimentally verify the accuracy of the i‐CMT. The experimental results are consistent with the theoretical and simulated values, proving the feasibility of using the i‐CMT to analyze and design asymmetric coupled devices. Moreover, the application of the i‐CMT confirms the presence of additional coupling terms in three or more coupled objects, making the calculation of eigenfrequency more accurate.