Enhanced coupling of terahertz radiation to cylindrical wire waveguides
Enhanced coupling of terahertz radiation to cylindrical wire waveguides
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DOI：
10.1364/opex.14.000279
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发表时间：
2006-01-09
期刊：
影响因子：
3.8
通讯作者：
Mittleman, DM
中科院分区：
文献类型：
--
作者：
Deibel, JA;Wang, KL;Mittleman, DM
线波导最近被证明在传输脉冲太赫兹辐射方面很有价值。该技术依赖于输入耦合的散射机制的使用。当线偏振太赫兹脉冲聚焦在线波导和另一金属结构之间的间隙时，激发出径向极化表面波。通过基于有限元方法的模拟计算了输入耦合效率。另外的有限元结果表明，采用径向对称的光导天线可以提高耦合效率。实验结果证实，这种天线可以产生太赫兹辐射，耦合到径向波导模，大大提高了效率。(C)2006年美国光学学会。
Wire waveguides have recently been shown to be valuable for transporting pulsed terahertz radiation. This technique relies on the use of a scattering mechanism for input coupling. A radially polarized surface wave is excited when a linearly polarized terahertz pulse is focused on the gap between the wire waveguide and another metal structure. We calculate the input coupling efficiency using a simulation based on the Finite Element Method (FEM) Additional FEM results indicate that enhanced coupling efficiency can be achieved through the use of a radially symmetric photoconductive antenna. Experimental results confirm that such an antenna can generate terahertz radiation which couples to the radial waveguide mode with greatly improved efficiency. (c) 2006 Optical Society of America.