由两个不同开口环谐振器组成的双谐振超颖表面的可调谐群延迟
Tunable group delay in a doubly resonant metasurface composed of two dissimilar split-ring resonators
摘要：
提出了一种利用双谐振超颖表面连续控制电磁波群延迟的方法。该方法是基于i）在具有两个谐振线的介质中的群速度对谐振线宽的依赖性和ii）由开口环谐振器组成的超表面的谐振线宽对电磁波的入射角的依赖性。为了验证这种方法的群延迟控制，我们设计了一个太赫兹超颖表面组成的两个开口环谐振器具有不同的谐振频率和数值分析的超颖表面的传输特性。在斜入射条件下，观察到双共振线，且共振透射下降随入射角的增大而变深变宽。双共振线中心频率附近的群延迟随入射角的变化范围为0 ~ 20倍入射波周期。与先前报道的方法使用电磁诱导的类超材料的群延迟的可变控制相比，对于小的群延迟条件实现了高透射率。
英文摘要：
We develop a method to control the group delay of electromagnetic waves continuously using a doubly resonant metasurface. The method is based on the dependences of i) the group velocity in a medium featuring two resonance lines on the resonance linewidths and ii) the resonance linewidth of a metasurface composed of split-ring resonators on an incidence angle of electromagnetic wave. To verify this method for group-delay control, we design a terahertz metasurface composed of two split-ring resonators with different resonance frequencies and numerically analyze the transmission characteristic of the metasurface. Double resonance lines are observed for oblique incidence and the resonance transmission dips become deeper and broader with increasing the incidence angle. The group delay at around the center frequency of the double resonance lines is found to vary in the range about from 0s to 20 times the period of the incident wave with the incidence angle. In contrast with a previously reported method for variable control of group delay using electromagnetically-induced-transparency-like metamaterials, a high transmittance is achieved for a small group delay condition.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
