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. 2010 Jul 1;27(7):1555-60. doi: 10.1364/JOSAA.27.001555.
We propose systematic investigations of the electromagnetic enhancement by a single nano-groove in gold substrate. The impacts of the groove parameters and of the illumination conditions on the enhanced intensity are explored using a fully vectorial numerical method. The obtained data can be well predicted and explained by a simple Fabry-Perot model. By virtue of the semi-analytical model, we identify two main factors that enable giant electric-field enhancement in very narrow grooves: the Fabry-Perot resonance and the large wave impedance of the fundamental mode in the groove.
我们提议对金基底中单个纳米凹槽的电磁增强进行系统研究。使用全矢量数值方法探究凹槽参数和光照条件对增强强度的影响。通过一个简单的法布里 - 珀罗模型可以很好地预测和解释所获得的数据。借助半解析模型，我们确定了在非常窄的凹槽中实现巨大电场增强的两个主要因素：法布里 - 珀罗共振和凹槽中基模的大波阻抗。
