Circular dichroism in double-layer metallic crossed-gratings
Circular dichroism in double-layer metallic crossed-gratings
复制标题
双层金属交叉光栅的圆二色性
DOI：
10.1088/2040-8978/13/11/115101
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发表时间：
2011-11-01
影响因子：
2.1
通讯作者：
Tam, Wing Yim
中科院分区：
文献类型：
--
作者：
Gao, Wensheng;Leung, Ho Ming;Tam, Wing Yim
我们报道了利用电子束直写技术和剥离工艺制作双层金交叉光栅的方法。交叉光栅在可见光范围内表现出强的圆二色性，这取决于入射方向，这是由于旋绕的顶部金光栅和基板。还观察到圆偏振光透射率的共振下降。实验结果定性解释模拟使用有限积分技术。模拟结果证实，在透射率的下降是电磁谐振对应的平行和反平行的电流在交叉光栅。
We report on the fabrication of double-layer gold crossed-gratings consisting of a convoluted top gold grating superposed on a bottom gold grating by using an e-beam direct write technique together with a lift-off process. The crossed-gratings exhibit, in the visible range, strong circular dichroism which is dependent upon the incident direction due to the convoluted top gold grating and also the substrate. Resonance dips in the transmittance of circularly polarized light are also observed. The experimental results are explained qualitatively by simulations using a finite-integration technique. The simulations confirm that the dips in the transmittance are electromagnetic resonances corresponding to parallel and anti-parallel current flows in the crossed-gratings.