利用单轴晶体片实现偏振转换和单向传输
Realizing polarization conversion and unidirectional transmission by using a uniaxial crystal plate
摘要：
我们发现，电磁波的偏振态可以很容易地使用一个单一的薄单轴晶体板操纵。通过对坐标系进行旋转变换和控制平板厚度，可以实现TE波和TM波在一个谱段内的完全偏振转换。我们表明，非对角元素的介电常数是极化转换的关键。我们的分析可以清楚地解释实验中发现的结果与超材料。最后，我们提出了一种简单的基于偏振转换和表面等离子激元激发的单向传输装置。
英文摘要：
We show that polarization states of electromagnetic waves can be manipulated easily using a single thin uniaxial crystal plate. By performing a rotational transformation of the coordinates and controlling the thickness of the plate, we can achieve a complete polarization conversion between TE wave and TM wave in a spectral band. We show that the off-diagonal element of the permittivity is the key for polarization conversion. Our analysis can explain clearly the results found in experiments with metamaterials. Finally, we propose a simple device to realize unidirectional transmission based on polarization conversion and excitation of surface plasmon polaritons.
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