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1.
新型含偶氮聚合物薄膜表面微结构的刻写研究   总被引:6,自引:5,他引:1  
基于偶氮苯聚合物的光致异构和光致取向特性,开展了双偶氮苯功能化聚合物薄膜表面微结构的"刻写"研究.利用两束相干光照射,在样品表面"刻写"出了亚微米量级的光栅结构;利用分步法在样品表面制作出了清晰的"三角格子"等花样微结构,证明了双偶氮苯功能化聚合物对于表面微结构的制作有较强的可操作性.通过对比单偶氮和双偶氮材料的实验结果,证明了双偶氮聚合物具有响应时间快、衍射效率高等特点,并由此讨论了偶氮苯聚合物薄膜表面微结构的形成机理及其偏振选择性.  相似文献   

2.
吕子瑶  潘雨佳  王长顺 《物理学报》2017,66(24):244203-244203
在不同温度下,分别测量了掺杂偶氮材料、偶氮聚合物和偶氮液晶聚合物的光致双折射行为,并利用双e指数模型对光致双折射的动力学过程进行了拟合.实验结果表明,偶氮材料的光致双折射源于偶氮分子的光致异构和光致分子取向,光致双折射大小随温度的升高表现出先增大后减小的趋势.在抽运光的作用下,含偶氮材料的光致双折射包含一个由偶氮分子取向引起的快过程和一个由偶氮分子带动大分子取向引起的慢过程.关闭抽运光后,掺杂偶氮材料和偶氮聚合物表现为可逆的弛豫,而偶氮液晶聚合物则展现出长久光存储特性.  相似文献   

3.
偶氮苯聚合物的光致异构与分子链段的取向效应   总被引:4,自引:3,他引:1  
谢仲辉  张灵志 《光子学报》1998,27(8):699-703
本文通过实验和计算机模拟对偶氮苯聚合物光致双折射的写入、弛豫、擦写特性进行研究并对光致双折射的产生机制提出了一个新模型.指出对光致双折射有贡献的不仅是光致异构,分子链段的取向也有贡献,因而导致光致双折射有快和慢两个过程。  相似文献   

4.
偶氮苯聚合物薄膜光致微结构的研究   总被引:1,自引:1,他引:1  
利用光场梯度力理论,对前向四波混频光路制作偶氮苯聚合物薄膜表面微结构的结果进行解释,经过分析认为用这种方法制作亚微米微结构存在机理缺陷.采用“Step-by-Step”制作偶氮苯聚合物薄膜表面四方微结构,该方法将是制作二维亚微米微结构的有效手段,同时指出这种规则微结构光学各向异性特点有利于二维光子晶体完全带隙的形成.  相似文献   

5.
在交联的偶氮聚合物材料薄膜上制作了轴对称相位延迟片。基于偶氮聚合物的光致异构特性,搭建了偏振光诱导装置。将偶氮薄膜材料放在可旋转的平台上,激发光照射在旋转台的半径方向从而在薄膜内部诱导形成轴对称分布的偶氮分子阵列。利用探测光实时检测偶氮薄膜在激发光的作用下的相位延迟量。通过编写软件,在计算机上记录下制作过程中探测光通过放置于正交偏振片组中的偶氮薄膜的光强曲线。制作完成后,通过搭建的轴对称延迟片主轴测量光路,对延迟片的轴对称性进行了测量,并用CCD记录下了测量图案。实验测得薄膜材料的双折射达到0.0205,厚度为3μm,相位延迟为65°。  相似文献   

6.
谢茹胜  赵有源 《物理学报》2011,60(5):54202-054202
研究一种新型的并列式的高密度存储材料ADPA-PVK-PBA-TNF聚合物薄膜.在非吸收区用光抽运测试法研究了薄膜光致双折射,获得光致双折射变化值Δn=1.3×10-3,分析了该聚合物薄膜光致取向增强的物理和化学机理.探讨了抽运光对光致双折射的增强和抑制效应.在此基础上初步实现了多重角度复用信息存储、获得了较为清晰的全息存储图像.并讨论了图象存储的增强/抑制效应,利用这种效应可对存储图像处理或删除. 关键词: 掺杂偶氮苯聚合物薄膜 光致双折射 光全息存储 光致取向增强  相似文献   

7.
合成了带有不同取代基的偶氮苯基团和可交联丙烯酸基团的共聚物,并通过控制热聚合的反应条件获得一系列不同交联密度的聚合物薄膜. 红外光谱表征样品交联度是从0到32%. 不同交联密度的偶氮聚合物薄膜的光致取向行为的研究结果表明交联能够降低光致取向速率以及薄膜的最大透过率. 进一步的重复擦写实验还表明交联薄膜能够有效抑制在线偏光擦写过程中偶氮苯分子的趋光性质量迁移.  相似文献   

8.
新型聚偶氮苯取向增强光折变效应及全息存储   总被引:1,自引:1,他引:0  
合成了新型偶氮分子偶氮二苯胺ADPA(Azo-diphenylamine),将其掺入聚乙烯咔唑Poly(N-Vinylcarba-zole)(PVK)和聚丙烯丁酯(Poly-butylacrylate)(PBA)的聚合物(PVK-PBA)以及三硝基芴酮2,4,7-trinitro-9-flu-orenone(TNF)聚合制成薄膜器件。结果表明掺杂偶氮苯聚合物薄膜在非共振吸收下具有强的光致取向增强光折变效应。光致折射率变化值Δn达到1.3×10-3以上。样品在两相干光束作用下,可建立光折射率光栅,其衍射效率可超过30%,实现了光全息存储。讨论了影响折射率光栅的因素,并对全息存储相关结果形成的机制进行了分析。  相似文献   

9.
偶氮苯聚合物薄膜光致六角对称微结构   总被引:2,自引:2,他引:0  
利用前向箭并四波混频光路,在偶氮苯聚合物薄膜表面制作出六角对称的晶体微结构,观察到多个相位共轭波,当三束入射光都处在p偏振态时,在样品表面可得到一维光栅,当三束入射光中有一束在p偏振态,另两束在s偏振态时,在样品表面上得到的是六角对称微结构,这一结果表明,光场强度周期性变化及光场偏振态对晶格微结构的形成非常重要。  相似文献   

10.
报道了通过宏观测量偶氮聚合物光致异构效应,及其引起的光学各向异性变化,讨论了一种影响偶氮聚合物顺反异构效应的有效途径。在偶氮高分子聚合物中,添加了不同浓度的Ag纳米粒子,采用了波长为442nm的He-Cd偏振激光为激发光源,当Ag纳米粒子掺杂质量浓度为0.12μg/ml的时候,激发了薄膜样品中Ag纳米粒子的等离子体共振效应,增强了粒子周围纳米尺度的电磁场强度,相当程度上提高了偶氮聚合物光致异构的转换效率;另外,研究了不同的取代基同纳米Ag粒子的相互作用对光致异构效应的影响,探讨了一种能够有效地控制光致异构效应的方法。  相似文献   

11.
徐则达  蔡志岗 《物理学报》2000,49(6):1091-1093
报道了偶氮苯聚合物薄膜中的斑图形成,横向效应及准晶结构.用简并四波混频实验手段,通过扫描电子显微镜和偏光显微镜观察发现有机薄膜中有许多小岛形成的斑图并形成准晶结构.实验证明通过写入光偏振态的适当组合可以控制有机薄膜中斑图结构.为有机薄膜的纳米结构技术开创了一条新路. 关键词:  相似文献   

12.
The time evolution of photoinduced surface relief grating formation on azobenzene polymer films is analyzed by particle method for fluid mechanics. The surface relief grating is grown by using two beams interference with various polarization states numerically and compared with experimental results. The force acted on the dipole by electromagnetic field and surface force are considered as the driving force for photoinduced mass transport. The improved surface tension model is proposed in order to calculate curvature coefficient. The numerical results are coincided with experimental results qualititatively.  相似文献   

13.
Spatial light modulation by use of a biphotonic holographic grating has been demonstrated in an azobenzene-doped polymer film. The mechanism of incoherent-to-coherent optical conversion originates from the photoinduced trans <--> cis isomerization of azobenzene molecules by two color lights. It is also found that when the intensity of the blue beam is varied the output replica of the input information changes sign.  相似文献   

14.
A model of the alignment of azobenzene molecules in polymer film induced by all-optical poling is proposed and verified by experiment. We found that when the writing beams of frequencies ω and 2ω are both linearly polarized with their polarization directions parallel to each other, azobenzene molecules tend to reorient to the direction perpendicular to the writing beams polarization. At the end of the writing process, more molecules orient to the direction perpendicular to the writing beams polarization than those which orient to the parallel direction. The alignment of molecules parallel or perpendicular to the polarization of the writing beams is characteristic of polarity or no polarity, respectively. The alignment of molecules along the polarization of writing beams results in the second order nonlinearity in the polymer film. According to the model, a new method to improve the optical poling efficiency is put forward.  相似文献   

15.
Fully reversible light-induced switching of the capacitance with changes larger than 50% has been achieved by using photo-active thin polymer films. The films consist of PMMA polymer blended with high concentrations of branched azobenzene ether dye molecules. Polymer thin sheet capacitors can be easily produced by spin coating and drop casting in various thicknesses ranging from 100 nm to 8 μm, respectively. Reversible capacitance switching is induced by illumination with UV and visible light, respectively. The capacitance change is correlated to the trans to cis isomerization of the azobenzene ether molecules and the alignment of the molecular dipoles in the film. Switching times depend on chromophore concentration, film thickness and light intensity used. The influence of wavelength of the light, of the temperature as well as of an electrical field applied during illumination on the capacitance change is addressed.  相似文献   

16.
The effects of tightly focused, higher-order laser beams on the photoinduced molecular migration and surface deformations in azobenzene polymer films are investigated. We demonstrate that the surface relief is principally triggered by longitudinal fields, i.e., electric fields polarized along the optical axis of the focused beam. Our findings can be explained by the translational diffusion of isomerized chromophores when the constraining effect of the polymer-air interface is considered.  相似文献   

17.
Polarization holographic recording was investigated in a liquid-crystalline azobenzene side-chain polymer. A highly stable polarization holographic grating with the diffraction efficiency of 12.6% was written in the polymer film by two orthogonally linearly polarized 532 nm beams with equal intensities of 150 mW/cm2. The polarization grating was studied with a 633 nm probe beam by surveying the conversion of the polarization state of the probe beam and measuring the dependence of diffraction efficiency on the polarization direction of the probe beam. It was found that the ± first-order diffraction efficiency and the polarization of the diffracted wave depended strongly on the polarization of the readout wave. The unusual diffraction properties of the recorded grating were attributed to the presence of the circular photoinduced birefringence. PACS 42.40.Ht; 42.40.Lx; 78.20.Fm  相似文献   

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