光栅光调制器周期结构的优化分析与实验  

Optimized design and experiment for periodic structure of grating light modulator

作　　者：史玲娜[1,2] 潘英俊[2] 韦玮[2] 黄尚廉[2] 

机构地区：[1]重庆交通大学理学院,重庆400074 [2]重庆大学光电工程学院,重庆400030

出　　处：《光电子．激光》2010年第6期808-812,共5页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(60708017);全国博士后基金资助项目(20070410773);重庆市院士基金资助项目(CSTC;2008BC3002)

摘　　要：针对光栅光调制器的光学调制特点,建立一种可变周期结构的光栅光调制器模型,采用Matlab软件中的数字图像处理方法进行研究。利用傅里叶变换分析两种周期结构的光栅光调制器在频谱面和像面的光场分布,并得到不同周期结构对器件调制对比度的影响。实验得到了两种结构像面的光强输出对比。结果表明:不同周期结构对器件的亮态调制效果影响不大;当器件上下反射面中心对齐,下层反射面在器件周期方向两侧各超出上层光栅面的1/2倍光栅间隙宽度时,器件具有最佳的暗态调制效果,从而得到了光栅光调制器的一种周期结构优化方案。In order to research the effect of the periodic structure on the performance of grating light modulator（GLM）,a model of GLM with alterable periodic structure is built,and the digital image processing method in MATLAB software is used.First,based on Fourier transform,the light field distribution on the spectrum plane and image plane of two kinds of GLM with different periodic structures is analyzed,and the influence of different periodic structures on the contrast of modulation is calculated and tested.The results indicate that when the modulator displays to be bright,the display will be not affected by the periodic structure.While the modulator displays to be dark,the display will be obviously affected by the periodic structure.When the periods of upper and lower reflector are 5,the highest contrast can be gotten.

关 键 词：微光机电系统(MEMS) 光栅光调制器(GLM) 衍射 周期性 显示 

分 类 号：TB133[机械工程—光学工程]