深圳大学学报理工版

分析以矢量理论求解二元简单周期结构衍射效率的原理和过程,探讨一种高性能偶数分束器设计方法,通过自编程序在太赫兹波段获得二元结构偶数分束器,有效抑制了零级衍射,突破传统标量方法设计的局限性.探讨了该设计方法利用共振效应及倏逝波传播效应抑制零级衍射光,以及将能量分配到其他非零级次上的物理机理.

This paper analyses the principle and process to solve the diffraction efficiency of gratings with binary simple period structures by applying vectorial theory and explores a method to design a high-performance even-beam splitter. By programming, we obtain an even splitter with a binary structure in the Terahertz range. Thus, the zero-order diffraction is suppressed effectively, and it breaks the design limit of the traditional scalar theory. In addition, we discuss the physical mechanism of the method to suppress the zero-order diffraction by resolving the energy to the non-zero-order diffractions due to the resonance effect and the evanescent wave propagation effects.

引言
1 设计理论
2 优化设计方法及结果
3 物理机理分析
4 结语

图1 亚波长二元周期结构模型

图2 遗传算法与严格耦合波法相结合优化亚波长矩形周期光栅结构参数流程图<br/>Fig.2 Flow chart of grating parameters optimization by combining GA with RCWA

图2 遗传算法与严格耦合波法相结合优化亚波长矩形周期光栅结构参数流程图
Fig.2 Flow chart of grating parameters optimization by combining GA with RCWA

$图3 基于高阻硅的太赫兹4分束器各级输出衍射效率分布图<br/>Fig.3 Distributions of the efficiency of each diffraction order of a silicon-based terahertz even splitter$

图3 基于高阻硅的太赫兹4分束器各级输出衍射效率分布图
Fig.3 Distributions of the efficiency of each diffraction order of a silicon-based terahertz even splitter

表1 太赫兹偶数分束器设计结果<br/>Table 1 Results of a designed terahertz even beam splitter

表1 太赫兹偶数分束器设计结果
Table 1 Results of a designed terahertz even beam splitter

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备注

引言

1 设计理论

2 优化设计方法及结果

3 物理机理分析

4 结语

期刊信息

备注

引言

1 设计理论

2 优化设计方法及结果

3 物理机理分析

4 结 语

期刊信息

4 结语