共查询到20条相似文献,搜索用时 78 毫秒
1.
应用复合二元颗粒材料的空间平均电场、平均电位移之间的关系及复合介质的非线性光学性质,表示出复合介质的有效介质函数εe=F(ε_1,ε_2,f1).假设在线性极限下第I组份的ε_I(I=1,2)为常数时,应用微扰理论,导出了复合介质的非线性有效极化率x_e,该结果与MG近似理论和EMA近似理论比较应用范围更广.用该理论对Cu纳米颗粒嵌入(SiO_2)基质中组成Cu-SiO_2薄膜进行相应分析,其结果与Hamanaka的实验结果相吻合. 相似文献
2.
应用复合二元颗粒材料的空间平均电场 、平均电位移 之间的关系及复合介质的非线性光学性质,表示出复合介质的有效介质函数 。假设在线性极限下第i组份的 为常数时,应用微扰理论,导出了复合介质的非线性有效极化率 ,该结果与MG近似理论和EMA近似理论比较应用范围更广。用该理论对Cu纳米颗粒嵌入(SiO2)基质中组成Cu-SiO2薄膜进行相应分析,其结果与Hamanaka的实验结果相吻合。 相似文献
3.
文章综述了目前纳米材料的研究方向和应用前景。 相似文献
4.
5.
刘仁明 《淮阴师范学院学报(自然科学版)》2011,10(5):405-408
研究了金/银和银/金核壳结构球形纳米颗粒复合体系的非线性光学性质.结果表明,可以通过改变颗粒的核壳结构组分、结构参数以及复合颗粒的体积分数等手段来获得有效三阶非线性极化率的增强. 相似文献
6.
以CeCl3·7H2 O为铈源、NH3· H2 O为矿化剂、HCl为酸性调节剂,利用水热法成功制备了二氧化铈纳米颗粒.采用X射线衍射仪(XRD)、扫描电子显微镜(SEM )、紫外‐可见分光光度计(UV‐Vis)、荧光分光光度计(PL )、拉曼光谱(Raman)和振动样品磁强计(VSM )等分析测试手段,对CeO2纳米颗粒的晶相、形貌、光学和磁学性质进行了表征.XRD测试结果表明样品的晶格参数略高于块状CeO2的,并随着pH值的增大而减小.所有样品的形貌均为球形.从紫外‐可见吸收光谱中,估计出的样品直接带隙值小于块状CeO2的,且此值随pH值的增加而增加.pH值为2时合成样品具有室温铁磁性,此性质的出现可能与Ce3+和氧空位的存在有关. 相似文献
7.
SiC薄膜具有结构不易控制,透明性较差的特点,采用PECVD方法淀积的纳米SiC薄膜经光学透过率测试表明,在637nm和795nm处高的光透过率,并且当薄膜的厚度增大时,仍然具有高透过率的特性,这一结果表明,PECVD技术具有制备结构均匀,透明的纳米SiC薄膜的优势,同时,在与非晶SiC薄膜进行对比中发现非晶SiC薄膜的透过率不如纳米SiC薄膜。 相似文献
8.
构造介质的非简谐振子的非线性方程 ,利用组合因子代替非线性项进行多次迭代 ,得到了n阶光学极化率的一般表达式 相似文献
9.
本文设计了多层膜金属狭缝阵列,并用有限元方法研究了该阵列的透射特性.结果表明,与传统的单层薄膜金属狭缝阵列相比,多层膜金属狭缝阵列可以实现介质层内局域电场增强,并在透射光谱中产生多个透射峰.此外,本文还研究了介质层的厚度、位置周期等对多层膜金属狭缝阵列透射特性的影响,这些结果将对调节透射峰的位置及更深刻理解多层膜金属狭缝的光学异常透射现象具有一定的指导意义. 相似文献
10.
本文用拉曼谱和光致发光谱研究了PbSnS3纳米棒的光学性质.PbSnS3纳米棒的拉曼谱可用两种声子模式解析.PbSnS3纳米棒在紫外线激发下发蓝光. 相似文献
11.
12.
Ag-聚酯复合薄膜的微结构与光学性能研究 总被引:1,自引:1,他引:0
用匀胶机在载玻片上甩制5%的硅酸乙酯薄膜,在该薄膜上用磁控溅射法溅射Ag制备半连续的纳米微粒Ag薄膜,经过不同温度下的退火,处于膜表面的Ag颗粒的扩散运动增强,从而得以渗入高分子聚酯层形成Ag-聚酯复合薄膜.采用X射线衍射和紫外-可见光谱等检测手段对其微结构和光学性能进行测试与分析发现:随着退火温度的增加,Ag晶粒的晶化现象越来越明显,平均晶粒尺寸和晶格常数均呈增大趋势.随着Ag质量分数的增加,Ag的XRD衍射峰出现并逐渐增强,Ag纳米颗粒表面等离子体共振吸收峰位置逐渐红移并逐渐增强. 相似文献
13.
Hao Yan Jian-cheng Zhang Chen-xia You Zhen-wei Song Ben-wei Yu Yue Shen 《矿物冶金与材料学报》2009,16(2):226-229
Fe3O4 magnetic nanoparticles were synthesized by the hydrothermal method, and the influences of the surfactant sodium bis(2-ethylhexyl) sulfosuecinate (AOT) on the particles were investigated. The structure, morphology, and magnetic properties of the products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), and vibrating sample magnetometer (VSM). It is confirmed that the as-prepared nanoparticles have been modified by using the surfactant during the synthesis process. The amount of the surfactant has an effect on the size, the dispersal, and the magnetic properties of the particles. Besides, the mechanisms of the influences were also discussed. 相似文献
14.
Colloidal indium-doped zinc oxide (IZO) and tin-doped zinc oxide (ZTO) nanoparticles were successfully prepared in organic solution,with metal acetylacetonate as the precursor and oleylamine as the solvent.The crystal and optical properties were characterized by X-ray diffraction,UV-visible spectrophotometry,and fluorescence spectroscopy,respectively;the surface and structure morphologies were observed by scanning electron microscopy and transmission electron microscopy.The XRD patterns of the IZO and ZTO nanoparticles all exhibited similar diffraction peaks consistent with the standard XRD pattern of ZnO,although the diffraction peaks of the IZO and ZTO nanoparticles were slightly shifted with increasing dopant concentration.With increasing dopant concentration,the fluorescent emission peaks of the IZO nanoparticles exhibited an obvious red shift because of the difference in atomic radii of indium and zinc,whereas those of the ZTO nanoparticles exhibited almost no shift because of the similarity in atomic radii of tin and zinc.Furthermore,the sizes of the IZO and ZTO nanoparticles distributed in the ranges 20-40 and 20-25 nm,respectively,which is attributed to the difference in ionic radii of indium and tin. 相似文献
15.
以阿霉素为模型药物、N-乙烯基吡咯烷酮为单体,通过反相乳液聚合法制备了聚乙烯吡咯烷酮为载体的阿霉素抗癌纳米颗粒.用激光粒度仪测量了纳米颗粒的粒径大小和粒径分布,同时研究了乳化剂浓度、引发剂浓度、体系水量和反应温度对纳米颗粒尺寸的影响. 相似文献
16.
利用剑桥晶体数据库(SCD)数据,用MOPAC半经验程序AMI方法计算了含非对称中心的4-N-甲基苯乙烯吡啶盐类晶体分子的二阶极化率,并用CSD提高的晶体结构数据计算了该类化合物阳离子的平面性,探讨了该类化合物取代基的性质和分子的平面性对分子二阶极化率的影响。 相似文献
17.
CHENYuting ZHUXiaorong SUNZhenrong NIURuimin WANGZugeng LANGJianping XUZhizhan LIRuxin 《科学通报(英文版)》2004,49(12):1220-1223
Nonlinear optical properties of a metal cluster [PPh4][Cp*MoS3(CuBr)3] have been studied, with the third-order susceptibility χ^[3]) for this cluster determined by degenerate four-wave mixing (DFWM) experiment, the optical limiting (OL) effect observed by transmission technique,and the nonlinear absorption measured by using Z-scan technique. 相似文献
18.
Nonlinear optical properties of graphene-based materials 总被引:1,自引:0,他引:1
Graphene,a two-dimensional carbon atom sheet,has attracted tremendous attention and research interest because of its exceptional physical properties.Graphene has high mobility and optical transparency,in addition to flexibility,robustness and environmental stability.The main focus so far has been on fundamental physics and electronic devices.However,because the linear dispersion of the Dirac electrons enables ultrawideband tunability,we believe its true potential lies in photonics and optoelectronics.In this review,we introduce recent advances in the nonlinear optical properties of graphene-based materials.The rise of graphene in nonlinear optics is shown by several recent results,ranging from saturable absorbers and the four-wave mixing effect to giant two-photon absorption,reverse saturable absorption and optical limiting.The relevant forms of the graphene-based materials include pure graphene,graphene oxide and graphene hybrids. 相似文献
19.
20.
建立一套频谱仪线路的动态光散射实验系统,讨论建立过程中若干关键实验技术问题,该系统可用于测量微小粒子及大分子的尺寸,测量范围为0.01 ̄2.00μm。 相似文献