二维光栅光调制器阵列的光学分析与实验

基于标量衍射理论分析了二维光栅光调制器的衍射特性,提出了投影系统的光学处理方法,利用Matlab软件进行了仿真分析.分析结果表明,二维光栅光调制器的衍射光强分布是单个像素衍射光强的干涉叠加,其分布趋势与单个光调制器的衍射光强分布类似;通过反傅里叶变换可将各个调制器的衍射光重新分开而成像.如果用±1级衍射光的成像,相位为2kπ的调制器在投影面得到一个明亮的像,而相位为(2k-1)π的调制器在投影像面上得到一个黑暗的像.通过一个基于静态微光电系统光栅光调制器的投影光学系统得到了一幅明暗调制的像,证明了光栅光调制器用于投影显示的可行性.

Optical Analysis and Experiments of Two-Dimensional Grating Light Modulator Array

Diffraction characteristic of a two-dimensional (2D) grating light modulator is analyzed with scalar diffraction theory, the optical analysis method of the projection system based on grating light modulator is proposed. The processing is simulated with Matlab software. Diffraction light distribution of the 2D modulator is the coherent superposition of diffraction light distribution of modulators, and the distribution is similar to that of a single modulator. The diffraction light can be divided and imaged by the projection lens based on the anti-Fourier transform process. If the first-order diffraction light is used as the projection light, the modulator with 2kπ phase difference shows a bright pixel in the image plane, but the modulator with (2k-1)π phase difference shows a black pixel. A projection system based on a static micro-electromethanical system (MEMS) grating light modulator array was setup, and a static image is gotten. The result proves the feasibility of grating light modulator for projection display.