基于矢量理论分束器设计方法及其机理的探讨  

A method to design beam-splitters based on vectorial theory and discussion on its physical mechanism

作　　者：黄海漩[1] 徐平[1] 阮双琛[1] 杨拓[1] 袁霞[1] 黄燕燕[1] 

机构地区：[1]深圳大学电子科学与技术学院,深圳518060

出　　处：《深圳大学学报（理工版）》2015年第2期172-177,共6页Journal of Shenzhen University(Science and Engineering)

基　　金：国家自然科学基金资助项目(61275167);深圳市基础研究计划资助项目(JCYJ20130329103020637)~~

摘　　要：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.

关 键 词：电磁波物理 亚波长 二元结构 偶数分束器 严格耦合波法 抑制零级衍射 

分 类 号：TM154.4[电气工程—电工理论与新技术]