孔阵形状对周期孔阵金属薄膜透过率的影响  

Influence of Aperture Shape on Extraordinary Transmission Through Periodically Perforated Metal Films

作　　者：曹玉蓉[1] 叶永红[1] 

机构地区：[1]南京师范大学物理科学与技术学院,江苏南京210097

出　　处：《南京师大学报（自然科学版）》2009年第3期37-41,共5页Journal of Nanjing Normal University(Natural Science Edition)

基　　金：国家自然科学基金(60778041);江苏省普通高校自然科学研究计划(07KJA51001)资助项目

摘　　要：采用高频结构仿真软件对中红外波段周期结构金属薄膜的光透射增强现象进行了数值模拟.通过对圆形、椭圆、正方形以及长方形4种不同孔阵金属薄膜的仿真得出,金属微孔的几何形状对透过率增强有着重要的影响.当椭圆或长方形金属孔阵长短径比例增加时,透射峰随着比例的增大红移;比较4种金属薄膜的透射峰移动情况发现,长方形和椭圆的形状效应较为明显.上述结果显示局域模式在透射增强现象中起了重要的作用.此外,我们还对长方形和椭圆孔阵列在不同偏振光入射下的光透射性质进行了模拟.The High Frequency Structure Simulator is used to simulate the enhanced transmission through periodically perforated metal films in the middle-infrared region. We studied the circle,ellipse,square and rectangular hole arrays and demonstrated （with different shapes） that the transmission properties are strongly influenced by the hole shape. For the ellipse and rectangular hole arrays,the position of the transmission peak shifts toward longer wavelength as the aspect ratio increases. By comparing the shift of the transmission peak among the above four arrays,we found that shape resonace of rectangular and ellipse holes is larger than the others. The simulated results indicate that localized modes play an important role in the enhanced transmission. The optical transmission properties of the ellipse and rectangular hole arrays under different polarization of the incident light are also simulated.

关 键 词：周期孔阵金属薄膜 透过率增强 数值模拟 孔阵形状 

分 类 号：O484.41[理学—固体物理]