Active Terahertz Spoof Surface Plasmon Polariton Switch Comprising the Perfect Conductor Metamaterial
Active Terahertz Spoof Surface Plasmon Polariton Switch Comprising the Perfect Conductor Metamaterial
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DOI：
10.1109/ted.2009.2030838
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发表时间：
2009-09
影响因子：
3.1
通讯作者：
Kyungjun Song;P. Mazumder
中科院分区：
文献类型：
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作者：
Kyungjun Song;P. Mazumder
报道了利用人工波纹完美导体超材料实现太赫兹（THz）有源开关的可行性，证明了通过改变周期性沟槽金属结构中波纹的折射率，可以很容易地控制强局域化的太赫兹欺骗表面等离子体激元（SSPP）模式。具体而言，本文表明，纳入电光材料，如液晶到等离子体激元间隙导致一个高度紧凑和高效的太赫兹开关，由低电压控制信号激活。通过这种新方法实现的SSPP开关的优化设计显示：1）强的亚波长SSPP局部化; 2）相对高的消光比;以及3）小的阻尼衰减。此外，与简单的微米级架构相关联的设计灵活性提供了一种有前途的方法，以控制或操纵亚波长THz信号在未来的基于SSPP的紧凑型数字电路。
The feasibility of realizing an active terahertz (THz) switch by utilizing artificially corrugated perfect conductor metamaterials is reported in this paper by demonstrating that the strongly localized THz spoof surface plasmon polariton (SSPP) modes can be easily controlled by changing the refractive index of dielectrics inside a longitudinal metallic structure with a periodic array of grooves. Specifically, this paper shows that incorporation of electrooptical material such as a nematic liquid crystal into the plasmonic gap leads to a highly compact and efficient THz switch that is activated by a low-voltage control-signal. The optimal design of the SSPP switch enabled by this novel method shows: 1) a strong subwavelength SSPP localization; 2) relatively high extinction ratio; and 3) small damping attenuation. Furthermore, the design flexibility associated with simple micrometer-scale architecture provides a promising method toward controlling or steering the subwavelength THz signal in the future SSPP-based compact digital circuit.