基于侧链含四氟偶氮苯聚合物光栅特性的研究

发布时间：2017-12-31 05:30

本文关键词：基于侧链含四氟偶氮苯聚合物光栅特性的研究　出处：《苏州大学》2016年硕士论文　论文类型：学位论文

【摘要】：近年来,由于偶氮苯聚合物具有感光灵敏度高、抗疲劳性好、空间分辨率高等显著的特点,引起了研究者的广泛重视。本文针对侧链含四氟偶氮苯聚合物的感光特性以及光栅特性展开以下几方面的研究工作:首先对偶氮苯聚合物材料进行了介绍和归纳,并对其光致顺反异构、光致双折射、光致质量迁移和非线性光学等光响应特性进行了简单的叙述,介绍了在国内外关于偶氮苯聚合物在光信息处理方面的研究和应用。研究了侧链含四氟偶氮苯聚合物的成膜特性,通过实验测试了侧链含四氟偶氮苯聚合物的顺反异构特性。详细介绍了光致表面浮雕光栅的形成机理,以及研究激光强度、偏振组合、周期以及不同波长激光对表面浮雕光栅调制深度的影响,并以此为依据制作二维表面浮雕光栅。重点研究了侧链含四氟偶氮苯的光致双折射特性,对光致双折射的形成机理和测试原理进行了介绍,通过改变泵浦光强以及泵浦次数来测试其对样品薄膜的光致双折射的影响。根据双折射的弛豫现象以及反复擦写性质,设计了利用侧链含四氟偶氮苯聚合物全光开关的实验,并观测到其良好的效果。在侧链含氟偶氮苯聚合物光致双折射特性的基础上,对其进行双折射光栅的制作和分析。通过琼斯矩阵对S-P(偏振方向分别与入射面垂直和平行的偏振光)、S-S(偏振方向与入射面垂直的线偏振光)、P-P(偏振方向与入射面平行的线偏振光)和RCP-LCP(右旋与左旋圆偏振光)四种偏振光组合的衍射光场进行了理论分析,得出利用四种偏振光组合进行全息曝光所得双折射光栅的透射矩阵。选用四种偏振光组合进行记录全息光栅,分析双折射光栅的产生过程。同时根据测量双折射光栅的衍射光偏振态与理论相对比,分析其偏振转换的过程并进行解释,并选用三种不同波长的探测光对双折射光栅进行探测,验证其对衍射光偏振态的改变与波长无关。通过实验和理论计算各种偏振组合与不同周期形成双折射光栅的相位延迟量,得出随着周期的增大,相位延迟量逐渐达到饱和。
[Abstract]:In recent years, azobenzene polymers are characterized by high photosensitivity, good fatigue resistance and high spatial resolution. In this paper, the photosensitivity and grating characteristics of tetrafluoroazobenzene polymer with side chain have been studied as follows:. First, the azobenzene polymer materials were introduced and summarized. The optical response characteristics such as photoinduced isomerism, photoinduced birefringence, photoinduced mass migration and nonlinear optics are briefly described. The research and application of azobenzene polymer in optical information processing at home and abroad are introduced. The film forming characteristics of side chain tetrafluoroazobenzene polymer are studied. The isomerism properties of the side chain polymer containing tetrafluoroazobenzene were tested. The formation mechanism of photo-induced surface relief grating and the laser intensity and polarization combination were introduced in detail. The effect of the period and the different wavelength laser on the modulation depth of the surface relief grating was studied. The photoinduced birefringence of the side chain containing tetrafluoroazobenzene was studied based on the fabrication of the two-dimensional surface relief grating. The formation mechanism and testing principle of photoinduced birefringence are introduced. The influence of the pump intensity and the pump number on the photoinduced birefringence of the sample film was measured by changing the pump intensity and the pumping times. The experiment of all-optical switch with side chain containing tetrafluoroazobenzene polymer was designed and its good effect was observed. Based on the photoinduced birefringence of side chain fluoroazobenzene polymer. The fabrication and analysis of the birefringence grating is carried out. S-P (polarized light with the polarization direction perpendicular to the incident plane and parallel polarized light) is compared with the Jones matrix (linear polarized light with the polarization direction perpendicular to the incident plane). The diffraction field of P-P (linear polarized light with parallel polarization direction parallel to the incident plane) and RCP-LCP (right-handed and left-circumferential polarized light) is analyzed theoretically. The transmission matrix of birefringence grating obtained by holographic exposure with four kinds of polarized light combination is obtained. Four kinds of polarized light combination are selected to record holographic grating. The generation process of birefringence grating is analyzed, and the polarization conversion process is analyzed and explained by comparing the polarization state of diffraction light of birefringence grating with the theory. The birefringence grating is detected by three different wavelengths. It is verified that the change of polarization state of diffractive light is independent of wavelength. The phase delay of birefringent grating formed by various polarization combinations and different periods is calculated by experiment and theory, and the results show that the phase delay increases with the period. Phase delay is gradually reaching saturation.
【学位授予单位】：苏州大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：O631.24

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