三阶非线性光学聚合物材料

自１９８７年以来，三阶非线性光学聚合物材料越来越引起研究者们的浓厚兴趣。由于聚合物三阶非线性光学材料具有较大的三阶非线性光学系数，快速响应过程、低的介电常数以及及修饰，易成型等特点，极有可能在２１世纪初获得大规模应用。本文介绍了近年来三阶非线性光滂聚合物的进展。     

有机三阶非线性光学材料的研究进展

对有机三阶非线性光学响应的理论及实验（包括器件对材料的要求，理论研究，三阶极化率的测试技术，有机三阶光学材料）进行了综述。     

有机低分子三阶非线性光学材料

介绍了三阶非线性光学原理.根据分子结构特征对各类有机低分子三阶非线性光学材料的结构与性能关系作了评述,提出了分子设计有机三阶NLO材料的一些规律性结论.离域能小的共轭骨架,长的共轭链,吸供取代基的引入,取代基强的供电子性或吸电子性,长的吸供电子取代基之间的距离,以及良好的共平面程度等因素均有利于获得较大的三阶NLO性能.     

有机低分子三阶非线性光学材料

根据分子结构特征对各类有机低分子三阶非线性光学材料结构与性能的关系作了评述。根据三阶非线性光学基本原理对有机材料三阶非线性光学效应的机理和材料的分子设计作了分析。     

二茂铁酰胺类金属有机三阶非线性光学材料的合成

二茂铁经羧基化、酰氯化、与取代芳胺N-酰化等反应合成了7个二茂铁酰胺类金属有机三阶非线性光学材料,其中2个未见文献报道,收率41%～92%.材料结构经IR,1H NMR,MS表征确认.测定了各化合物的紫外-可见吸收光谱,简并四波混频实验检测显示该类化合物具有良好三阶非线性光学性能.     

金属有机非线性光学材料

本文介绍了非线性光学的简史，非线性光学材料的分类及应用，简述了金属有机非线性光学材料的原理，从分子工程和晶体工程的角度讨论了金属有机非线性光学材料的结构与性质的关系，综述了目前已研究的金属有机化合物和金属有机聚合物的二阶、三阶非线性光学材料，二阶非线性光学材料按目前所做的工作可以分成二大类：一类是含有芳香基或杂环的过渡金属羰基化合物；一类是含有二茂铁基和吸电子基的共轭体系化合物。三阶非线性光学材料的研究工作主要集中在酞菁类的金属配合物上，本文对金属有机化合物作为非线性光学材料的独特之处进行了总结，并对金属有机非线性光学材料的前景作了展望。     

高分子非线性光学材料和有关研究

非线性光学材料是未来光通讯的关键材料，高分子非线性光学材料在高频电光调制器和半导体－非线性光学聚合物集成电路等尖端应用领域的研究引起了有关方面的高度重视。主要介绍有关高分子非线性光学材料的基本概念，二阶非线性光学高分子的种类和制备方法，作者和合作者近年来在聚合物非线性光学材料研究领域所做的工作。     

聚酰亚胺基二阶非线性光学材料

二阶非线性光学材料作为光电子中的关键材料已引起了研究人员极大的兴趣。而聚酰亚胺作为一种二阶非线性光学材料的基体除了具备有机聚合物的共有优点如易加工成型外,还比其它聚合物基二阶非线怀光学材料具有更高的玻璃化转变温度,更优异的耐热性能、电性能和机械性能,是目前被选用最多的二阶非线性光学材料的聚合物基体之一。本文对近年来聚酰亚胺基二阶非线性光学材料的制备、性能研究以及极化松驰方面的研究进展进行了评述。     

新型二阶非线性光学聚合物的研究

研究了互栓网络型聚合物的电晕极化及其二阶非线性光学性质，与其它类型极化聚合物进行的比较表明它是一种很有潜力的新型非线性光学材料。     

英美科学家致力于非线性光学聚合物研究

英美科学家致力于非线性光学聚合物研究随着光通信和光计算技术的发展，非线性光学（ＮＬＯ）材料已成为目前光学材料研究的热点，尤为引人注目的是ＮＬＯ聚合物研究。传统非线性光学材料大都是无机晶体，如石英、铌酸锂及二氢磷酸酯等。但它们都具有脆性，难以生长成大晶...     

Organic Materials for Third-Order Nonlinear Optics

The current status of organic low-molecular weight and polymeric materials for third-order nonlinear optics is reviewed. The importance of organic materials lies in their promise of large nonlinear optical figure of merit, high optical damage thresholds, ultrafast optical responses, architectural flexibility, and ease of fabrication. Organic materials exhibiting interesting third-order nonlinear optical properties are discussed to illustrate the importance of structure–property correlations. Results on emerging organic materials that include liquids, dyes, fullerenes, charge-transfer complexes, π-conjugated polymers, dye-grafted polymers, organometallic compounds, composites, and liquid crystals are presented. Organic nonlinear optical materials seem promising for a wide range of applications and their potential for integrated optics should be further explored.     

Functionalized gold nanoparticles self-assemblies with efficient nonlinear optical properties

Satellite-patterns aggregate structures of gold nanoparticles were fabricated by the inducing pi-pi stacking interactions. The self-assembly process of satellite-patterns was tuned by the controlling ligand exchange on the surface of spherical gold nanoparticles, which provide a novel concept and an efficient method for controlling self-assembly of gold nanoparticles. With increasing the porphyrin alkanethiol ratio (r) of gold nanoparticles, the self-assembly induces to form the larger satellite-structures. The study indicates that exchange process of tetra-n-octylammonium bromide molecules and porphyrin alkanethiol molecules results in the formation of satellite-pattern structures with topological features. Nonlinear optical properties of porphyrin alkanethiol capped gold nanoparticles of toluene solution were measured using the Z-scan technique, and its third-order nonlinear optical susceptibility (chi(3)) is calculated as 0.9 x 10(-13) esu, presented the third-order nonlinear optical properties. The well-ordered assembly of gold nanoparticles exhibits controlled the third-order nonlinear optical properties, which can be enhanced with the increasing of the porphyrin alkanethiol ratio in systems.     

高三阶光学非线性Cd/CdS-SiO2复合薄膜的电化学–溶胶凝胶制备及表征

以硝酸镉、硫脲和正硅酸乙酯为前驱体, 采用电化学-溶胶凝胶法, 以ITO玻璃为基底制备了透明薄膜。扫描电子显微镜(SEM)表征表明薄膜为纳米束结构。X射线能谱(EDX)表征表明薄膜由Si、O、Cd、S元素组成, Cd/S(原子比)＞1。EDX表征结合循环伏安(CV)实验确定薄膜为Cd/CdS-SiO₂复合薄膜。Z扫描表征表明, 薄膜在1064 nm处表现出自散焦特性的非线性折射效应和饱和吸收特性的非线性吸收特性。薄膜的三阶非线性极化率(χ(3))较高, 达到了1.18×10^-14~1.39×10^-13 (m/V)², 表明薄膜具有优良的三阶光学非线性。分析认为薄膜中CdS的含量对薄膜的光学性非线性起主要作用。     

玻璃光学碱度与三阶非线性光学极化率

介绍了玻璃光学碱度的概念,讨论了玻璃光学碱度与三阶非线性光学极化率之间的变化规律,分析了二元硼酸盐、硅酸盐、锗酸盐、碲酸盐、钛酸盐玻璃系统中光学碱度与三阶非线性光学极化率之间变化的定性趋势和定量方程,总结了玻璃光学碱度的本质及其影响,对进一步研究不同玻璃系统中光学碱度与三阶非线性光学极化率之间定量关系的趋势进行了展望.     

碲基复合材料薄膜的三阶非线性光学特性

采用电化学诱导溶胶-凝胶法在导电玻璃片上制备了具有三阶非线性光学特性的碲基复合薄膜材料. 采用SEM( 扫描电镜)和EDX( X 光电子能谱)对薄膜的表面形貌和组成进行表征; 应用分光光度计得到薄膜的透射光谱、反射光谱、吸收光谱, 并结合脉冲激光器和 Z 扫描方法测量薄膜的三阶非线性光学特性. 实验结果表明制备的薄膜呈网状结构, 表面组分主要包括Si、Te、O元素; 薄膜在波长为1064nm处呈现负的非线性折射效应和饱和吸收的性质, 其非线性折射系数和非线性吸收系数分别为-4.18×10 ^{- 13} m²/W和-1.6×10 ^{- 6} m/W, 表明了碲基复合薄膜有较强的非线性光学效应, 得到三阶极化率为1.13×10 ^{- 14} (m/V)², 表明复合薄膜具有优良的三阶非线性光学性能.     

Third-order nonlinear optical properties of 2-adamantylamino-5-nitropyridine caused by cascaded second-order nonlinearity

2-Adamantylamino-5-nitropyridine (AANP) was reported to have large nonlinear optical properties d₃₁ of 80 pm/V and have an ability of type II phase-matching by using d₁₅. The χ⁽²⁾:χ⁽²⁾ cascading effect via second-order optical nonlinearity produces the same effect of the third-order optical nonlinearity in phase-matching condition. We investigated the third-order nonlinear optical properties via cascaded second-order optical nonlinearity of AANP crystal at telecommunication wavelength range.     

非线性光学聚合物材料

非线性光学聚合物是一类新型的功能高分子材料，在光电子技术和集成光学等领域有广阔的应用前景，文中在介绍非线性光学效应和极化原理的基础上，综述了非线性光学聚合物材料研究现状及进展，着重阐述了掺杂型，功能型及共轭型等非线性光这聚合物的结构与性能，应用优势的存在的问题，并指出了这类材料的研究方向和发展趋势。     

Tuned longitudinal surface plasmon resonance and third-order nonlinear optical properties of gold nanorods

In order to elucidate the relationship for third-order nonlinear optical properties of anisotropic metal nanoparticles between the incident laser wavelength and surface plasmon resonance (SPR) wavelength, gold nanorods (GNRs) with a tuned longitudinal SPR mode in frequency were prepared by seed-mediated methods with two different surfactants, cetyltrimethylammonium bromide (CTAB) and benzyldimethylammonium chloride (BDAC). The real and imaginary parts of the third-order nonlinear optical susceptibilities χ(3) were examined by near-infrared (800 nm) femtosecond Z-scan and I-scan techniques for various gold sols with SPR wavelengths of 530 nm (spheres), 800 nm (nanorods) and 1000 nm (nanorods), named as 530GNSs, 800GNRs and 1000GNRs, respectively. All the samples showed intrinsically third-order nonlinear optical refractive responses. However, as for the real part of χ(3) for one particle, 800GNRs whose plasmon peak was tuned to the incident laser wavelength exhibited a Reχ(3) value 45 times stronger than 530GNSs. More interestingly, the imaginary part of χ(3) was more greatly influenced at the tuned SPR wavelength. Here we first demonstrate that 800GNRs showed plasmon-enhanced saturable absorption (SA) due to a longitudinal SPR tuned to the incident laser wavelength.     

Organic materials for nonlinear optics

This review discusses nonlinear optical (NLO) polymeric materials. As an example of a second-order NLO material, a novel copolymer with a diazo dye attached is investigated. The second-order NLO coefficient χ⁽²⁾ of the copolymer reaches 1.0 × 10^?6 esu, which is 7 times larger than that of LiNbO₃. A third-order NLO coefficient χ⁽³⁾ larger than 10^?10 esu is obtained for polymers where NLO dyes are introduced into the polymer backbone. The optical transmission loss of these polymers is revealed to be around 2 dB/cm. As these polymers can be formed into channel waveguides using the photo-bleaching technique, they show promise for use in NLO devices because of their processability, transparency and large optical nonlinearity.