Spatial Light Modulators Using Non-Linear Photonic Crystal

设计了一种用于光学信息处理和显示的高速电寻址空间光调制器。建议使用光子晶体来最小化驱动电压，因为它增加了材料的电光效应。该器件在由聚合物膜厚度和折射率确定的特定波长处显示出尖锐的光谱。我们可以通过施加电场改变聚合物的折射率来控制单色光的强度。使用由偶氮染料分散红1（DR 1）掺杂的聚甲基丙烯酸甲酯（PMMA）组成的体系作为聚合物材料。通过施加11 Vrms的交流电压获得70：1的对比度。调制速度超过10 MHz，极化聚合物光调制器实现了空间滤波。在30 ~ 40 V电压下实现了输入图像的光强调制和边缘增强。利用二维聚合物像素阵列，可以实现更复杂的空间频率滤波和更高的分辨率。具有高二阶非线性光学系数的材料是近年来发展起来的。利用非线性有机材料中的分子同步，可以实现二维或三维有源光子晶体器件。这些具有聚合物材料的标准具调制器在光学计算中具有应用，包括光学神经网络和光学图像处理。

A high speed electronically addressed SLM is designed here for optical information processing and display. The use of a photonic crystal is proposed to minimize the driving voltages because it increases the electrooptic effect of the material. The device shows a sharp spectrum in a specific wavelength determined by the polymer film thickness and refractive index. We can control the intensity of monochromatic light by changing the refractive index of the polymer by applying an electric field. A system consisting of azo dye disperse red 1 (DR1) doped poly-methyl-methacrylate (PMMA) is used as a polymeric material. The contrast ratio of 70:1 was obtained by applying ac voltage of 11 Vrms. Modulation speed over 10 MHz is obtained.Spatial filtering using a poled polymer light modulator is also demonstrated. Light intensity modulation and edge emphasis of the input image are realized with 30〜40 V applied voltage. By using 2-D array of polymer pixels, more complex spatial frequency filtering and higher resolution can be expected.We have already reported the light modulation on Si integrated circuits. Materials with high second order nonlinear optic coefficients have been developed recently. By use of molecular synchronization in nonlinear organic materials, 2-demensional or 3-demensional active photonic crystal device can be realized. These etalon modulators with polymeric materials have applications in optical computing, including of optical neural networks and optical image processing.