Exceptional Terahertz Wave Modulation in Graphene Enhanced by Frequency Selective Surfaces
Exceptional Terahertz Wave Modulation in Graphene Enhanced by Frequency Selective Surfaces
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DOI：
10.1021/acsphotonics.5b00639
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发表时间：
2016-02
期刊：
影响因子：
7
通讯作者：
R. Yan;S. Arezoomandan;B. Sensale‐Rodriguez;H. Xing
中科院分区：
文献类型：
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作者：
R. Yan;S. Arezoomandan;B. Sensale‐Rodriguez;H. Xing
在本文中，我们从理论和实验上分析了太赫兹超材料调制器的混合石墨烯/金属堆叠结构组成的设计权衡。在这些器件中，石墨烯被用作有源介质，而被动金属频率选择表面被用来增强石墨烯中的光-物质相互作用。当改变关键的几何结构参数时，我们观察到我们的实验和理论之间的密切匹配，表明在这些设备中可以实现调制深度，插入损耗和速度之间的最佳权衡。此外，传输线为基础的紧凑的数学模型，以解释我们的实验观察和预测这些结构的性能限制。
In this paper we theoretically and experimentally analyze the design trade-offs in terahertz metamaterial modulators consisting of hybrid graphene/metal stacked structures. In these devices graphene is used as the active medium, whereas a passive metallic frequency selective surface is employed to enhance the light–matter interaction in graphene. When altering the key geometrical structural parameters, we observe a close match between our experiments and theory, showing that it is possible to achieve an optimal trade-off between modulation depth, insertion loss, and speed in these devices. Moreover, a transmission line based compact mathematical model is introduced in order to explain our experimental observations and predict the performance limits in these structures.