| 金属周期性结构光栅亚波长凹槽对透射率的影响 |
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| 引用本文： | 王艳花,陈跃刚,张岩,刘树田. 金属周期性结构光栅亚波长凹槽对透射率的影响[J]. 光电子．激光, 2007, 18(8): 938-941 |
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| 作者姓名： | 王艳花 陈跃刚 张岩 刘树田 |
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| 作者单位： | 哈尔滨工业大学应用物理系,黑龙江,哈尔滨,150001;首都师范大学物理系,北京,100037;首都师范大学物理系,北京,100037;哈尔滨工业大学应用物理系,黑龙江,哈尔滨,150001 |
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| 基金项目： | 北京市跨世纪优秀人才培养计划 |
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| 摘 要： | 利用时域有限差分算法(FDTD)模拟了二维金属光栅的电磁场,分析了金属光栅透射率随波长的变化.金属的介电常数随频率变化关系采用Drude模型.金属光栅每个单元刻蚀有1个亚波长宽度的缝和1个相同宽度的凹槽,凹槽深度可变.这种结构相对于1个周期内只有1个狭缝的结构,透射率曲线上出现1个凹陷,加深凹槽的深度,这个凹陷的位置会向长波方向移动.给出了一个简单的解析式来近似确定透射率中出现凹陷的位置.
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| 关 键 词： | 金属光栅 亚波长 凹槽 透射率 |
| 文章编号： | 1005-0086（2007）08-0938-04 |
| 修稿时间： | 2006-07-14 |
Transmission Characters of the Periodic Metallic Grating with Grooves |
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| WANG Yan-hu,CHEN Yue-gang,ZHANG Yan,LIU Shu-tian. Transmission Characters of the Periodic Metallic Grating with Grooves[J]. Journal of Optoelectronics·laser, 2007, 18(8): 938-941 |
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| Authors: | WANG Yan-hu CHEN Yue-gang ZHANG Yan LIU Shu-tian |
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| Affiliation: | 1. Department of Applied Physics,Harbin Institute of Technology ,Harbin 150001 ,China; 2. Department of Phys ies,Capital Normal University,Beijing 100037,China |
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| Abstract: | Grooves play an important role in the transmission effidency of the metallic grating. The structure to excavate a groove in a cell of the period grating with one slit displays a dent in the transmission spectrum compared with the structure with only a slit in the cell. Increasing the depth of the groove can move the position of the dent in the tranmission spectrum to the longer wavelength direction. An analytical equation is also provided to approximately locate the dent. |
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| Keywords: | metallic grating subwavelength grooves transmission |
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