Zhang Siwen, Liu Haitao, Mu Guoguang
Key Laboratory of Opto-Electronic Information Science and Technology, Ministry of Education, Institute of Modern Optics, Nankai University, Tianjin 300071, China.
J Opt Soc Am A Opt Image Sci Vis. 2011 May 1;28(5):879-86. doi: 10.1364/JOSAA.28.000879.
We present comprehensive investigations of the electromagnetic enhancement by a periodic array of rectangular nanogrooves in a metallic substrate. The impacts of array parameters and of illumination conditions on the enhanced electric-field intensity are explored using fully vectorial methods. The calculations are performed mainly for gold and for the visible and infrared wavelengths. The fully vectorial results are reproduced and explained by a simple Fabry-Perot model. Compared with the case of a single groove, the electric-field enhancement of the groove array is found to be much higher by almost 1 order of magnitude, which is shown to be related to the excitation of surface plasmon polaritons with the aid of the model. Practical considerations of a finite groove number and of a finite groove length are also provided.
我们展示了对金属基底中矩形纳米槽周期性阵列所产生的电磁增强效应的全面研究。利用全矢量方法探究了阵列参数和照明条件对增强电场强度的影响。计算主要针对金以及可见光和红外波长进行。全矢量结果通过一个简单的法布里 - 珀罗模型进行再现和解释。与单个凹槽的情况相比，发现凹槽阵列的电场增强要高得多，几乎高出1个数量级，借助该模型表明这与表面等离激元极化激元的激发有关。还提供了关于有限凹槽数量和有限凹槽长度的实际考虑因素。
