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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。
Based on the scalar diffraction theory, the diffraction characteristics of two-dimensional grating optical modulator are analyzed. The optical processing method of the projection system is proposed. The simulation analysis is carried out by Matlab software. The results show that the diffraction intensity distribution of a two-dimensional grating optical modulator is an interference superposition of the diffracted light intensity of a single pixel, and the distribution tendency of the two-dimensional grating light modulator is similar to that of a single optical modulator. By using the inverse Fourier transform, The diffracted light of the device is separated and imaged. If using a ± 1 order diffracted light image, a modulator with a phase of 2kπ produces a bright image at the projection surface and a modulator with a phase of (2k-1) π produces a dark image at the projected image surface. A bright and dark modulated image was obtained by a projection optics system based on a static micro-electro-optic grating optical modulator, which proves the feasibility of the grating optical modulator for projection display.