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研究了不同偏振全息模式下基于交联偶氮苯聚合物薄膜的相位光栅的形成机理、衍射效率和偏振特性。利用琼斯矢量表征了正交线偏振(SP)和平行线偏振(SS)干涉模式下的偏振干涉场。基于SP和SS两种模式,制作了无明显表面起伏的纯折射率光栅和有表面起伏的浮雕光栅。偏光显微镜(POM)观测说明纯折射率光栅具有周期性的折射率分布;近场光学显微镜(SNOM)探测说明纯折射率光栅和浮雕光栅的表面起伏在5nm以下和85.23nm。实验表明,当探测光为水平偏振时,纯折射率光栅的衍射效率达到22.2%,浮雕光栅只能达到1.65%。纯折射率光栅的0、+1级衍射光分别为水平和竖直线偏振光,偏振度达到0.9969和0.9963;浮雕光栅的0、+1级衍射光均为水平线偏振光。
The formation mechanism, diffraction efficiency and polarization characteristics of phase grating based on cross-linked azobenzene polymer films under different polarization holographic modes were studied. The Jones Jones vector was used to characterize the polarization interference field in orthogonal linear polarization (SP) and parallel linear polarization (SS) interference modes. Based on the SP and SS modes, a pure refractive index grating with no apparent surface undulation and a relief grating with a surface relief were fabricated. POM observation shows that the pure refractive index grating has a periodic refractive index distribution. The near-field optical microscope (SNOM) detection shows that the surface roughness of the pure refractive index grating and the relief grating is below 5 nm and 85.23 nm. Experiments show that when the probe light is horizontally polarized, the diffraction efficiency of the pure refractive index grating reaches 22.2%, and the relief grating can only reach 1.65%. The 0 and +1 order diffracted light of the pure index grating is horizontal and vertical linearly polarized light respectively, and the degree of polarization reaches 0.9969 and 0.9963. The 0 and +1 order diffracted lights of the relief grating are horizontal linearly polarized light.