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重庆大学光电工程学院 光电技术及系统教育部重点实验室 重庆,400030
收稿日期:2007-01-22,
修回日期:2007-02-18,
网络出版日期:2007-06-30,
纸质出版日期:2007-06-30
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张 洁, 黄尚廉, 张智海, 等. 蟹型悬臂梁对光栅平动式光调制器性能的影响[J]. 光学精密工程, 2007,15(3):315-320.
ZHANG Jie, HUANG Shang-lian, ZHANG Zhi-hai, et al. Influence of crab-cantilever on performance of grating moving light modulator[J]. Optics and precision engineering, 2007, 15(3): 315-320.
基于MOEMS(Micro-opto-electro-mechanical Systems)的光栅平动式光调制器依靠结构中的蟹型悬臂梁在静电力作用下的上下运动来改变可动光栅和下反射面的距离
从而实现对光能量的调制。本文依据傅里叶光学对光栅平动式光调制器(Grating Moving Light Modulator
GMLM)工作状态的光学特性进行了详细的理论分析和计算机仿真。分析了可动光栅的光栅周期数为偶数和奇数时
由于几何中心的不同
使得采用傅里叶光学分析时透过率函数不同的问题
并对GMLM衍射光能量的分布进行了详细的理论推导;重点讨论了GMLM结构中边框和蟹型悬臂梁对对比度的影响。结果表明
为了得到较高的对比度
应减小边框宽度、悬臂梁的宽度和长度
文章用图形给出了直观说明。
The light modulator based on Micro-opto-electro-mechanical System(MEMS) has already become a research focus in projection display field. The structure of Grating Moving Light Modulator (GMLM) supported by four crab-cantilevers is composed of reflection plate
address electrode
four crab-cantilevers and grating plate. In this paper
the influence of crab-cantilevers on GMLM performance was analyzed.The diffraction intensity of GMLM was discussed with Fourier optics
while the grating period number was odd and even integer. Especially
the influence of frame and four crab-cantilevers on GMLM performance was analyzed in detail. The result indicates that frame and crab-cantilever size should be reduced in design for obtaining a higher constrast ratio. Moreover
the relationship between contrast ratio and important structure parameter is shown in figures.
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