金属-电介质复合材料中非局域效应诱导的偏振分光器（英文）

Nonlocality-induced polarization beam splitting via metal-dielectric composites

基于具有强非局域效应的金属-电介质多层膜结构提出了三种偏振分光器.当多层膜结构的平均介电常数为零时,横电偏振电磁波对应的等频率曲线为一很小的圆,而横磁偏振电磁波对应的等频率曲线则为两支抛物线,这是由表面等离激元诱导的非局域效应引起的.利用该多层膜结构在不同偏振电磁波下等频率曲线表现出巨大差异这一特性,提出了三种偏振分光器,其中包含厚度远小于波长的超薄偏振分光器.这些结果有望在偏振选择吸收体以及集成光子器件中有潜在应用.

Three kinds of polarization beam splitters are designed by using a simple metal-dielectric multilayered structure with strong nonlocality. It is found that the equal frequency contour for the transverse electric polarization is a small circle when the average permittivity is close to zero. At the same time, the equal frequency contour for the transverse magnetic polarization turns to be two branches of parabolas due to the surface plasmon-induced nonlocal effect. Based on the dramatic difference between dispersions of the two polarizations, three kinds of polarization beam splitters are demonstrated, including the ultrathin ones, which may have important applications in polarization-sensitive absorbers and compact optical devices.