论文总字数：12534字

摘 要

ABSTRACT ………………………………………………………….5

第一章 引言...............................................6

1.1 金属的介电特性 …………………………………………………………6

1.2 表面等离激元简介…………………………………………………………7

1.3 增强透射效应……………………………………………………………8第二章 模拟研究简介…………………………………………………10

2.1 CST微波仿真 …………………………………………………………10

2.2 单位模型及其电磁波参数 ……………………………………………10

第三章 基于小孔阵列的超构表面……………………………………11

3.1 阵列单元矩形孔 …………………………………………………………11

3.1.1各阶透射光强度 ………………………………………………11

3.2 阵列单元凸字孔 ………………………………………………………12

3.2.1各阶透射光强度 ………………………………………………13

3.3 本章小结 ………………………………………………………………14

1. 基于金属块的超构表面 ……………………………………15

4.1 矩形金属块阵列 …………………………………………………………15

4.1.1 阵列单元 ……………………………………………………………15

4.1.2 模拟图像 ……………………………………………………………15

4.1.3 各阶透射光强度 ……………………………………………………16

4.2 凸字形金属块阵列 …………………………………………………………18

4.2.1 阵列单元 ………………………………………………………………18

4.2.2 模拟图像 ………………………………………………………………19

4.2.3 改变金属块尺寸的透射衍射 ……………………………………21

4.2.4各阶透射光强度 ……………………………………………………21

第五章 总结 ………………………………………………………22

参考文献…………………………………………………………………………24致谢 ……………………………………………………………………25

摘 要

增强的光的衍射效应具有重要的应用价值，比如用于光谱分析、太阳能电池设计。传统的介电光栅可以实现这一效应；但是，通常光栅的厚度较大且表面起伏不平（如闪耀光栅）。近来等离激元材料吸引了人们广泛的关注。但是，更多的研究兴趣集中在亚波长结构上，其中高阶衍射被抑制。利用超波长结构的等离激元材料可以实现增强的光的衍射效应。

本文通过设计亚波长/超波长的二维金属光栅结构，实现理论上的超薄、高效率的1阶透射衍射光。

对于金属孔为元胞的光栅，对称的矩形孔1阶衍射光简并，并且效率不高。对于非对称的凸字孔元胞的光栅，能够分离1阶衍射光，但高效波段过窄。

而通过改进金属块的互补结构作为元胞的光栅透过效率增强。虽然矩形金属块依旧1阶简并，但凸字金属块的元胞光栅可以做到1阶衍射光能量分离，且较长波段内的能量效率增强。

关键词： 金属光栅 增强透射 能量分离

Abstract

Enhanced light diffraction effect has important applications.Such as using for spectral analysis, the solar cell design.Conventional dielectric grating may achieve this effect.However, the thickness of the traditional grating is usually large and undulating surface（such as Blazed grating）.Recently material of SPP has attracted widespread attention.However, more research interests focus on the sub-wavelength structure material.Wherein the higher-order diffraction is suppressed.Use other ultra-wavelength SPP material structure to achieve enhanced light diffraction effects

By design subwavelength / super-wavelength dimensional metal grating structure, to achieve theoretical ultra-thin, highly efficient transmission of the first-order diffracted light.

For grating whose cellular is metal holes. Symmetrical rectangular hole’s 1-order diffracted light is degenerate and inefficient. For non-symmetrical Braille hole Cellular grating, It can separate the first-order diffracted light, but its efficient band is narrow.

By improving the cellular structure of metal grating ,Complementary structureas is productivity enhancements. While still a rectangular metal block has 1-order degenerate, but Braille metal block cellular gratings can do a separate of 1-order diffracted light energy, and energy enhanced in long wavelength band.

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