由微波适配器造成的巨大负群延时

A. Carôt, H. Aichmann, G. Nimtz
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引用次数: 4

摘要

用两个微波导适配器作为反射器的类法布里-珀罗干涉仪产生了一个由于偏振位移而具有负群延迟时间的无源介电介质。在这种情况下,采用矩形带圆波导。其中一个适配器的偏振矢量的旋转应变与剧烈的负群速度的激发相耦合。所采用的矩形波导和圆形波导具有相同的色散。输入矩形波导的模式是线极化的,而适应的圆波导的基本模式是圆极化的。一个20米长的圆波导连接输入和输出适配器。实验在频域和时域上进行了再现。两种不同的手向反射圆波模式的偏振转向导致观测到的负群速度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Giant negative group time delay by microwave adaptors
A Fabry-Perot–like interferometer with two microwaveguide adaptors as reflectors creates a passive dielectric medium with a negative group delay time due to polarization shift. In that case rectangular with circular waveguides are adapted. A rotational strain of the polarization vector by one of the adaptors is coupled with the excitation of a drastic negative group velocity. The adapted rectangular and circular waveguides have the same dispersion. The input rectangular waveguide mode is linearly polarized, whereas the basic mode of the adapted circular waveguide is circularly polarized. A 20 m long circular waveguide connects the input with the output adaptor. Experiments are reproduced in the frequency and in the time domain. A polarization turn of the two different handed reflected circular wave modes causes the observed negative group velocity.
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