用光学差分吸收光谱监测大气中污染气体浓度

在实验室内模拟测量了实际大气中污染气体的差分吸收光谱 (DOAS) .本文在介绍差分吸收光谱技术同时 ,分析计算了污染气体的浓度 .实验设计中被测气体为大气中的 2种主要污染气体 :工业锅炉的主要排放物SO2 和机动车尾气的主要成分NO .用氘灯作为光源测量其在紫外波段的特征吸收 ,并通过光纤束连接光栅光谱仪 ,由计算机自动采集和处理数据 .     

Near-field lithography on the azobenzene polymer liquid crystal films

In this article, we reported near-field research on azobenzene polymer liquid crystal films using scanning near-field optical microscopy (SNOM). Optical writing and subsequently topographic reading of the patterns with subwavelength resolution were carried out in our experiments. Nanometer scale dots and lines were successfully fabricated on the films and the smallest dot diameter is about 120 nm. The width of the line fabricated is about 250 nm. This method is also a choice for nanolithography. The mechanism of the surface deformation on the polymer films was briefly analyzed from the viewpoint of gradient force in the optical near field. The intensity distribution of the electric field near the tip aperture was numerically simulated using finite-difference time-domain (FDTD) method and the numerical simulation results were consistent with the experimental results.     

用二维光栅实现FPS互联网络

提出了一种应用二维光栅和简单的成像系统实现folded perfect shuffle(FPS)的新方法,该方法具有简单,易行的优点,实验证明,其效果良好.     

用棱镜实现高效率的完全混洗互连网络

提出了用棱镜的普通光学系统实现二维的完全混洗互，连网络的新方法，方法简单，可行，可能有效地利用光能，因而具有实用意义。     

偶氮液晶聚合物中的非线性光致双折射

介绍了在偶氮液晶聚合物薄膜P-CN中发现的非线性光致双折射现象,给出了非线性光致双折射实验的具体结果.采用Z扫描技术验证了光致双折射的非线性过程本质,测量了P-CN介质薄膜的非线性吸收系数.讨论了光致双折射涉及的异构化微观机理,并在此基础上提出了非线性光光异构化实现光致双折射的方法 关键词： 液晶聚合物 光致双折射 光致异构化     

偶氮侧链聚合物液晶的光学性质及其光存储应用

有机聚合物是一类非重要的非线性光学材料，它在光通信和高密度光存储等高技术领域中有良好的应用前景，文章介绍了偶氮侧链聚合物液晶的光学性质及其在光存储领域中的应用。     

Fluorescence Enhancement of a Polymer Planar Waveguide Doped with Rhodamine B and Ag Nanoparticles

Planar polymer multi-model waveguides doped with Ag nano-particles and rhodamine B are fabricated and investigated by the spectroscopy analysis method as well as the M-line method. Experimental results shown that fluorescence enhancement occurs when excited by a wide band wavelength with Ag nano-particle concentration at a certain level. The maximum enhancement factor in our experiment is obtained to be about 3.8 when excited by 350 nm. Our study may have potential applications in polymers optical elements, such as polymer waveguide lasers and amplifiers.     

不同价态金属离子对DNA构象的影响

用紫外分光光度法研究了不同价态金属离子对DNA大分子溶液构象的影响。研究结果显示: 金属离子与DNA的作用使DNA溶液的紫外吸收值下降, 即呈现减色效应, 同时减色效应的强弱与金属离子的价态有关。随着价态升高, 减色效应增强。由此说明, 金属离子与DNA的作用使DNA的构象趋于缩拢; 且随着金属离子价态升高, 缩拢程度增强, 甚至产生缩合。还用现代多聚电解质理论对以上现象进行了讨论, 结果是令人满意的。     

用角谱方法分析固体浸没透镜的近场光场

固体浸没透镜在超高度近场光存储和超分辨率显微观测中具有独特的作用，本文利用角谱理论并计及光波的矢量特性，分析了固体浸没透镜的近场矢量光场特性，给出了它的光场图样，并着重讨论了线偏光入射条件下，出射光场的偏振状态。