This letter presented a nematic liquid crystal (LC) based metal-dielectric-metal structure to fully electronically modulate the reflection phase of electromagnetic waves. The demonstrated structure is composed of a thin LC layer sandwiched between copper comb electrodes and a single slotted reflection array. Based on a proper application of the external electric field, the whole process of nematic LC molecular orientation is controlled. The innovative feeding method can actively prealign and deflect the orientation of LC molecules. Experimental results show that the maximum reflection phase shift is 189.2° at 114.9 GHz. This letter provides a practical way of regulating LC-based terahertz devices. The proposed structure is a potential candidate for the reconfigurable reflectarray antennas.

中文翻译：

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通过梳状电极和液晶对毫米波进行全电子相位调制

这封信提出了一种基于向列液晶（LC）的金属-介电-金属结构，可以完全电子调制电磁波的反射相位。演示的结构由夹在铜梳状电极和单个开槽反射阵列之间的薄LC层组成。在适当施加外电场的基础上，可控制向列LC分子取向的整个过程。创新的进料方法可以主动地预对准和偏转LC分子的方向。实验结果表明，在114.9 GHz处，最大反射相移为189.2°。这封信提供了一种调节基于LC的太赫兹器件的实用方法。所提出的结构是可重构反射阵列天线的潜在候选者。