Spatial Light Modulators Using Non-Linear Photonic Crystal

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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.