Abstract Polarization holography offers the possibility to register not only the intensity and phase of light, but also its polarization. When the interfering beams are with orthogonal linear polarizations, in addition to the photoinduced linear birefringence in the media, chiral structures are formed. They strongly influence the properties of the recorded polarization diffraction gratings. In the present work, we study photoinduced chirality in thin films, based on the azopolymer poly[1-[4-(3-carboxy-4-hydroxyphenylazo)benzenesulfonamido]-1,2-ethanediyl, sodium salt], shortly PAZO. Nanocomposite samples are also studied, prepared from the same azopolymer, doped with TiO2 nanoparticles with size 21 nm. Exciting light from a He-Cd laser ( λ = 442 nm) has been used, with input ellipticity varying from –1 (left circularly polarized light) to +1 (right circularly polarized light). The dependences of the output ellipticity and the angle of self-rotation of the polarization azimuth on the input ellipticity are presented. This allows us to estimate the effective value of the photoinduced circular birefringence and to evaluate the diffraction efficiency of a polarization holographic grating recorded with two plane waves with orthogonal linear polarizations.

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在具有正交线偏振光束的偏振全息情况下的光致手征结构

摘要 偏振全息术不仅可以记录光的强度和相位，还可以记录其偏振。当干涉光束具有正交线性偏振时，除了介质中的光致线性双折射外，还会形成手征结构。它们强烈影响记录的偏振衍射光栅的特性。在目前的工作中，我们基于偶氮聚合物聚[1-[4-(3-羧基-4-羟基苯基偶氮)苯磺酰胺]-1,2-乙二基钠盐]，简称PAZO，研究了薄膜中的光致手性。还研究了纳米复合材料样品，由相同的偶氮聚合物制备，掺杂了 21 nm 的 TiO2 纳米颗粒。已经使用了来自 He-Cd 激光器 (λ = 442 nm) 的激发光，输入椭圆率从 –1（左圆偏振光）到 +1（右圆偏振光）。给出了输出椭圆度和偏振方位角自转角对输入椭圆度的依赖性。这使我们能够估计光致圆双折射的有效值，并评估用两个具有正交线性偏振的平面波记录的偏振全息光栅的衍射效率。