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利用严格耦合波理论分析了埋入式光栅在45°入射时,垂直和平行于光栅栅线的两个不同观察平面的零级共振反射衍射特性。在垂直于光栅栅线的平面内,TE、TM偏振下零级反射共振波长分别为432nm和420nm,在平行于光栅栅线的平面内,TE、TM偏振下零级反射共振主峰波长分别为623nm和620nm,在两个平面内,零级共振衍射光的共振波长差别较大,观察到的衍射光颜色差别明显,定义为双通道特性并用实验进行证明,制作了相应的光变色器件。
The zero-order resonant reflection diffraction characteristics of two different observation planes perpendicular and parallel to the grating raster line at 45 ° incidence are analyzed by using the rigorous coupled-wave theory. In the plane perpendicular to the raster grid lines, the zero-order resonance wavelengths of TE and TM polarization are 432 nm and 420 nm, respectively. In the plane parallel to the grating grid, the main zero-order resonance wavelengths of TE and TM polarizations are 623 nm And 620 nm. The resonance wavelength of the zero-order resonance diffracted light is greatly different in both planes. The observed difference in the color of the diffracted light is obviously defined as the dual-channel characteristic and experimentally demonstrated, and the corresponding photochromic device is fabricated.