Strong polarization in the optical transmission through elliptical nanohole arrays
Strong polarization in the optical transmission through elliptical nanohole arrays
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DOI：
10.1103/physrevlett.92.037401
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发表时间：
2004-01-23
影响因子：
8.6
通讯作者：
Kavanagh, KL
中科院分区：
文献类型：
--
作者：
Gordon, R;Brolo, AG;Kavanagh, KL
在金属纳米孔阵列的光传输中观察到了很强的偏振依赖性。结果表明，偏振度由孔的椭圆率和取向决定，偏振轴垂直于椭圆的宽边。此外，退偏振比示出了平方依赖于孔的纵横比，这是讨论在耦合进入和退出的表面等离子体激元模式。所观察到的结果将是有用的剪裁的偏振行为的金属纳米光子元件在许多应用中，包括表面等离子体增强的光学传感和超快光开关。
Strong polarization dependence is observed in the optical transmission through nanohole arrays in metals. It is shown that the degree of polarization is determined by the ellipticity and orientation of the holes; the polarization axis lies perpendicular to the broad edge of the ellipse. Furthermore, the depolarization ratio shows a squared dependence on the aspect ratio of the holes, which is discussed in terms of coupling into and out of the surface plasmon modes. The observed results will be useful for tailoring the polarization behavior of metallic nanophotonic elements in many applications, including surface plasmon enhanced optical sensing and ultrafast optical switching.