Deibel Jason A, Wang Kanglin, Escarra Matthew D, Mittleman Daniel
Opt Express. 2006 Jan 9;14(1):279-90. doi: 10.1364/opex.14.000279.
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.
最近研究表明，金属丝波导对于传输脉冲太赫兹辐射很有价值。该技术依赖于使用一种散射机制进行输入耦合。当线偏振太赫兹脉冲聚焦在金属丝波导与另一个金属结构之间的间隙上时，会激发径向偏振表面波。我们使用基于有限元方法（FEM）的模拟来计算输入耦合效率。有限元方法的其他结果表明，通过使用径向对称的光电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，并且以大大提高的效率耦合到径向波导模式。
