基于导模共振光栅阵列的彩色图像再现

Reproducing Colored Image with Guided-Mode Resonance Gratings Array

利用导模共振(GMR)光栅阵列再现彩色图像,不同于传统的彩色油墨印刷中所采用的三色染料混合的方式,它是利用光栅的滤光特性直接从自然光中分离出红、绿、蓝三色光充当三基色来代替化学油墨。由于GMR光栅在偏振光入射下衍射曲线在特定波长处会呈现很强的共振峰,且旁带非常低,因此很容易得到高纯度的单色光。考虑到降低实际加工的难度,只通过改变光栅周期来移动共振峰的位置以获得所需的三种基元光栅结构,然后对这些基元光栅进行分布处理即可得到彩色图像。

A method of reproducing colored image with guided-mode resonance （GMR） gratings array is presented. It is different from traditional color impression which uses three kinds of pigment mixed to obtain various colors, but utilizes the filtering characteristics of grating to extract red, green and blue light which can be acted as three primary colors from natural light. As GMR grating shows strong resonant peak at specific wavelength as well as low sideband when illuminated by polarized light, monochromatic light with high purity can be obtained easily. In order to reduce the difficulty of actual manufacturing, only the period of grating is altered to shift the resonant position. After getting the three kinds of basic grating structures, colored image can be reappearred by distributing them. Computer simulation shows that using this method can restore colored images factually when the incident light is TE-polarized.