Ultrawide-bandwidth slow-light system based on THz plasmonic graded metallic grating structures
Ultrawide-bandwidth slow-light system based on THz plasmonic graded metallic grating structures
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DOI：
10.1103/physrevlett.100.256803
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发表时间：
2008-06-27
影响因子：
8.6
通讯作者：
Bartoli, Filbert J.
中科院分区：
文献类型：
--
作者：
Gan, Qiaoqiang;Fu, Zhan;Bartoli, Filbert J.
我们探索了一种新的机制，减缓太赫兹波的基础上的金属光栅结构的深度梯度，其色散曲线和截止频率在不同的位置是不同的。由于欺骗表面等离子体激元在截止频率处的群速度非常低，因此THz波实际上在不同频率的不同位置停止。可以通过改变光栅深度的等级来调谐停止波之间的分离。这种结构提供了在超宽光谱带上降低光速的优点，以及在各种温度下工作的能力，但对温度稳定性有严格的要求。
We explore a novel mechanism for slowing down THz waves based on metallic grating structures with graded depths, whose dispersion curves and cutoff frequencies are different at different locations. Since the group velocity of spoof surface plasmons at the cutoff frequency is extremely low, THz waves are actually stopped at different positions for different frequencies. The separation between stopped waves can be tuned by changing the grade of the grating depths. This structure offers the advantage of reducing the speed of the light over an ultrawide spectral band, and the ability to operate at various temperatures, but demands a stringent requirement for the temperature stability.