用于新一代高密度可录光盘的有机材料研究进展

本文在总结近几年来国内外文献和专利报道的最新研究成果基础上,简要阐述了新一代高密度可录光盘的数据存储机理以及激光器工作波长与有机材料薄膜最大吸收波长相匹配的要求,介绍了在蓝(紫)光波段内(350～400nm)具有显著吸收的有机材料研究概况,并讨论了这些有机材料作为新一代高密度可录光盘数据存储介质的可能性。最后,对有机材料用于新一代高密度可录光盘数据存储介质的研究重点以及今后的发展前景进行简要讨论和展望。     

新一代高密度数字多用光盘(HD-DVD)研究进展

文章综述了新一代高密度数字多用光盘的研究进展，介绍了多种新型蓝绿光高密度可录和可擦重写光盘存储材料，讨论了高密度数字多用光盘所面临的问题以及其解决方法，最后提出了中国超高密度光盘存储技术发展的研究思路。     

用于蓝光存储的无机材料的研究及进展

光存储朝着高密度、大容量、高数据传输率方向发展。下一代的光盘记录将从目前广泛使用的红光波段向蓝光波段发展。本文综述了可用于蓝光记录的新一代超高密度光盘无机存储材料的研究现状和新进展。     

用于蓝光存储的无机材料的研究及进展

光存储朝着高密度、大容量、高数据传输率方向发展。下一代的光盘记录将从目前广泛使用的红光波段向蓝光波段发展。本文综述了可用于蓝光记录的新一代超高密度光盘无机存储材料的研究现状和新进展。     

有机光电磁功能材料

有机光电磁功能材料是新一代材料。文章简要介绍了有机半导体、光导体、光致变色与电致变色材料、有机非线性光学材料、有机导体、超导体、导电高分子，以及有机铁磁材料和有机分子电子器件。     

窄带有机光电探测器的优化设计

针对基于无机材料的光电探测器需要借助滤光器或棱镜耦合实现窄带响应,提出了一种通过有机材料制备窄带光电探测器并提高吸收峰值和降低半高全宽的方法和结构。该器件由分布布拉格反射器和有机光电二极管构成。有机光电二极管的顶电极和底电极之间构成光学微腔。采用传输矩阵法,详细分析了分布布拉格反射器的中心波长、有机光电二极管透明顶电极和光敏感层的厚度对有机光电探测器吸收性能的影响。研究结果表明,Tamm等离激元共振波长接近光敏感层的光学带隙时,可获得半高全宽小于20 nm的窄带响应,并且吸收峰值在70%以上。基于PTB7∶PC~(71)BM和PTB7-Th∶IEICO-4F的有机光电探测器分别可用于探测红光和近红外光。该研究从基本物理机制出发,结合材料和器件结构可将有机光电探测器的响应窗口从可见光拓展至近红外光。     

亚酞菁薄膜的光谱和光存储性质研究

利用真空蒸镀法制备了一种新的三硝基溴硼亚酞菁（BTN－SubPc)薄膜。在室温下测试了该亚酞菁染料在溶液和薄膜态的吸收光谱、薄膜态的反射和透过光谱，发现该薄膜在500nm-650nm波长范围内具有优良的吸收和反射特性。在632.8nm光盘静态测试仪上测试了覆盖有金属反射层的BTN－SubPc薄膜的静态光存储性能，结果表明，用较小功率和较窄脉宽的激光辐照膜片时，可获得大于30％的反射率对比度，显示出该材料用作短波长光存储介质（特别是用于可录型数字多用光盘）的巨大潜力。     

辉光放电聚合物薄膜的红外性质研究

为了实现惯性约束聚变 (ICF)点火,需要制备出均匀的高密度燃料靶。对于氘氘 (DD) 冰层,红外均化技术可用于改善其内表面粗糙度。本文利用红外光谱仪和红外显微镜研究了辉光放电聚合物(GDP)薄膜和靶球的红外吸收性质,得到了GDP薄膜材料特定波长处的红外吸收系数。通过比较薄膜材料和靶球的红外吸收,证实了热处理可以降低GDP材料中的氧化位点,从而抑制羟基(—OH)峰的形成,优化DD冰层的红外均化效果。利用所得实验数据对DD均化实验中红外均化积分球所需要的红外功率和国家点火装置(national ignition facility, NIF)标准靶的红外透射率进行了估算,计算结果对DD冰红外均化实验具有重要指导作用。     

碱性品红敏化的光致聚合物在441nm短波长的全息存储特性研究

制备了一种以碱性品红为光敏剂的新型全息存储材料,且使用波长为441nm的He—Cd激光器成功研究了材料的全息特性。研究表明,该材料在短波长处仍具有较高的衍射效率、曝光灵敏度和较大的折射率调制度,衍射效率近60％,灵敏度为2．93×101c群／mJ,折射率调制度为8．85×10．。。在存储介质膜中存储了全息图像,再现图像较为清晰,对比度与保真度较为理想,说明该材料具有较好的全息存储性能,适合作为高密度全息存储介质。     

有机强磁性研究

在对有机强磁性体的概仿、源及其所特有的物理和作简要介绍的基础上，阐述了有机材料的强磁性研究的重要意义以及有机强磁体作为新材料可能具有的应用前景，评述了国内外目前有机强磁性的理论和实验研究现状，讨论了有机强磁体的获取途径和分子设计方法，关着重讨论了纯有机强磁性体的模型设计和结构分析等方面的工作。     

Design of wavelength-selective waveplates using genetic algorithm

Wavelength-selective waveplates, which act either identically or differently for plural wavelengths, are useful for optical systems that handle plural wavelengths. However, they cannot be analytically designed because of the complexity of their structure. Genetic algorithm is one of the methods for solving optimization problems and is used for several kinds of optical design (e.g., design of thin films, diffractive optical elements, and lenses). I considered that it is effective for designing wavelength-selective waveplates also and tried to design them using the genetic algorithm for the first time to the best of my knowledge. As a result, four types of wavelength-selective waveplate for three wavelengths (405, 650, and 780 nm) were successfully designed. These waveplates are useful for Blu-ray Disc/Digital Versatile Disc/Compact Disc compatible optical pickups.     

用太阳光谱测量空气中NO2浓度的方法研究

根据Noxon方法 ,利用NO2 在 430— 45 0nm范围内的吸收特性 ,测量空气中NO2 的浓度 .介绍了一种利用光学差分吸收原理 ,以太阳光为光源 ,二极管阵列为探测器 ,黄山光明顶上的太阳光谱为参考光谱测量大气中NO2 浓度的新光学方法 .     

Synthesis and optical properties of silver nanoparticles in ORMOCER

Experimental results on synthesis of metal nanoparticles in ORMOCER by ion implantation are presented. Silver ions were implanted into organic/inorganic matrix at an accelerating energy of 30?keV and doses in the range of 0.25?10¹⁷ to 0.75?10¹⁷?ion/cm². The silver ions form metal nanoparticles, which demonstrate surface plasmon absorption at the wavelength of 425?C580?nm. The nonlinear absorption of new composite materials is measured by Z-scan technique using 150?fs laser pulses at 780?nm wavelength. ORMOCER matrix shows two-photon nonlinear absorption, whereas ORMOCER with silver nanoparticles demonstrates saturated absorption. Some optical applications of these composite materials are discussed.     

用太阳光谱测量空气中NO2浓度的方法研究

根据Noxon方法,利用NO₂在430—450nm范围内的吸收特性,测量空气中NO ₂的浓度.介绍了一种利用光学差分吸收原理,以太阳光为光源,二极管阵列为探测器 ,黄山光明顶上的太阳光谱为参考光谱测量大气中NO₂浓度的新光学方法. 关键词： 太阳光谱 2垂直柱体密度')" href="#">NO₂垂直柱体密度 定日镜 环境空气质量监测     

GaP Raman Terahertz high accuracy spectrometer and its application to detect organic and inorganic crystalline defects

One of the most important uses of THz spectrometry is to detect defects in molecular structure or in crystals efficiently. We applied GaP Raman THz (GRT) spectrometer to detect and evaluate defects in inorganic and organic materials. High THz-wave absorption due to high defect density of GaSe crystal lowered the efficiency of THz wave generation, when the crystal is used as nonlinear material for DFG (Difference Frequency Generation). Defects in organic molecules could be observed as changes in frequency, intensities of the absorption, and broadenings of the spectra.     

Pulsed-laser generation of gold nanoparticles with on-line surface plasmon resonance detection

Size of nanoparticles is an important parameter for their applications. The real-time monitoring is required for reliable and reproducible production of nanoparticles with controllable size. We present results of our research on development of the system for the online nanoparticle characterization during their production by a laser. The laser ablation chamber which allows measurements of surface plasmon resonance spectra during the nanoparticle generation process has been designed and fabricated. The online characterization system was tested by producing and modification of gold nanoparticles. Nanoparticles were generated by nanosecond-laser (wavelength 1064 nm) ablation of gold target in deionized water, and optimal conditions for the highest nanoparticle productivity were estimated. The mean diameter of nanoparticles was determined using their absorption spectra measured in the real-time during the ablation experiments and from the TEM images analysis, and it varied from 20 to 45 nm. The mismatch between nanoparticle diameters, estimated using these two methods, is due to the polydispersity of the generated nanoparticles. The further experiments of laser-induced modification of colloidal gold nanoparticles were carried out using second harmonic (wavelength 532 nm) of nanosecond Nd:YAG laser and alteration in nanoparticle size were acquired by the online measurement system.     

TDDFT Investigation of the Electronic Structures and Photophysical Properties of Fluorescent Extended Styryl Push-Pull Chromophores Containing Carbazole Unit

Push-pull chromophores attached to carbazole based π-conjugating spacers bearing N-alkylamino donors, cyanovinyl and carbethoxy acceptors have been studied by the means of UV-Visible measurements. The intramolecular charge transfer (ICT) of these π-conjugated systems has also been tested by investigating the ability of the solute molecules to undergo shifts in their fluorescence emission maxima with increasing solvent polarity. Density Functional Theory [B3LYP/6-31G(d)] and Time Dependent Density Functional Theory [TD-B3LYP/6-31G(d)] computations have been used to have more understanding of the structural, molecular, electronic and photophysical parameters of push-pull dyes. The largest wavelength difference between the experimental and computed electronic absorption maxima was 45 nm. For emission, a largest difference of 61 nm was observed. The ground state and excited state dipole moments in different solvents were determined using experimental solvatochromic data and computed Onsager radii. The dipole moments of the molecules in the excited state were observed to be higher than in the ground state.     

Second Harmonic Generation in Bis Typed Organic Compounds

In systematic research on a series of new nonlinear organic materials, we found that Bis (4-nitrophenoxy) methane (BNPM) showed a large intensity of second harmonic light, which was 4.4 times as large as that of urea crystal by powder technique and easily crystallized from a solution. The crystal structure of BNPM, obtained by the X-ray diffraction method, was orthorhombic, space group P2₁2₁2 (point group 222), with unit-sell dimension a = 10.205 Å; b = 12.854 Å; c = 4.8822 Å. In addition, we found that the absorption edge of BNPM was 430 nm with a 0.9-mm-thick crystal, and we observed the second harmonic light with BNPM single crystal at the wavelength of 1064 nm and in the range from 906 nm to 990 nm.     

真空条件下不同波长固体激光烧蚀单晶硅的实验研究

通过倍频Nd：YAG固体激光的基波得到波长分别为532、355和266 nm的激光,研究了单晶硅（Si）对不同波长固体激光的吸收规律和3种不同波长激光在真空条件下烧蚀单晶Si的烧蚀特征。结果表明,单晶Si对波长为100~370 nm的紫外激光具有很好的吸收效果;在其他条件相同时,532 nm波长激光烧蚀单晶Si所需最低单脉冲能量（Ep=30 μJ）是355和266 nm波长激光烧蚀单晶Si所需最低单脉冲能量（Ep=15 μJ）的2倍;532、355和266 nm的激光烧蚀单晶Si的烧蚀阈值随着波长的变短而变小。