Forward/Backward Switching of Plasmonic Wave Propagation Using Sign-Reversal Coupling
Forward/Backward Switching of Plasmonic Wave Propagation Using Sign-Reversal Coupling
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DOI：
10.1002/adma.201700018
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发表时间：
2017-07-12
影响因子：
29.4
通讯作者：
Zhang, Baile
中科院分区：
文献类型：
--
作者：
Gao, Zhen;Gao, Fei;Zhang, Baile
具有与能量流方向相反的波前传播的后向波在光子超材料的上下文中引起了相当大的兴趣。然而，在相同频率范围内的前向波和后向波之间切换仍然是一个挑战。在这里，在微波制度的耦合设计表面等离子体共振器的平台上，等离子体波传播的多频带前向/后向开关被证明。这种方法利用了在紧密限制的光子模式之间切换耦合配置时发生的符号反转耦合。等离子体激元色散曲线的直接实验测量证实了等离子体激元波在相同频率范围内的前向/后向传播。该研究为亚波长等离子体波传输的前向/后向切换提供了一种解决方案，并可能在光子集成系统中找到潜在的应用。
Backward waves with wave-front propagation opposite in direction to that of energy flow have attracted considerable interest in the context of photonic metamaterials. However, switching between forward and backward waves in the same frequency range has remained a challenge. Here, on a platform of coupled designer surface plasmon resonators in the microwave regime, multiband forward/backward switching of plasmonic wave propagation is demonstrated. This approach makes use of sign-reversal coupling that occurs when switching the coupling configuration between tightly confined photonic modes. Direct experimental measurements of plasmon dispersion curves confirm the forward/backward propagation of plasmonic waves in the same frequency range. This study provides a solution to forward/backward switching of subwavelength plasmonic wave propagation, and may find potential applications in photonic integrated systems.