Slow light at terahertz frequencies in surface plasmon polariton assisted grating waveguide
Slow light at terahertz frequencies in surface plasmon polariton assisted grating waveguide
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DOI：
10.1063/1.3260236
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发表时间：
2009-11
影响因子：
3.2
通讯作者：
Jing Zhang;L. Cai;Wenli Bai;Yun Xu;Guofeng Song
中科院分区：
文献类型：
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作者：
Jing Zhang;L. Cai;Wenli Bai;Yun Xu;Guofeng Song
研究了一种亚波长光栅波导（GW），该波导由两个平行的金属板组成，其内部边界有周期性波纹，用于减缓太赫兹频率下的光速。在锥形输入端口的辅助下，我们的结构在宽带宽上的传输效率约为80%，并且在亚波长尺度上具有强约束。在此基础上，设计了3个梯度GWs，证明了欺骗表面等离子体激元在趋近于局部截止频率与入射光频率相同的位置时，会出现减速和渐近停止现象。
A subwavelength grating waveguide (GW) consisting of two parallel metallic slabs with periodic corrugations on their inner boundaries is developed to slow down the speed of light at terahertz frequencies. Assisted by a tapered input port, our structure has a transfer efficiency of about 80% over a broad bandwidth and strong confinement in the subwavelength scale. Based on the GW, three graded GWs are designed to demonstrate that the spoof surface plasmon polaritons are slowed down and asymptotically stopped when they tend to the location, where the local cutoff frequency is the same as the frequency of the incident light.