SBN60铁电薄膜横向电光系数及M—Z波导半波电压的研究

主要介绍MgO衬底上掺K和不掺K的SBN60铁电薄膜的横向电光系数r51的测量,并由此设计一种MgO衬底上M-Z型薄膜波导调制器,并计算出此种波导调制器的半波调制电压,实验说明掺入K离子能减少其半波调制电压。     

基于微机电系统技术的微型热电致冷器研究进展

介绍热电材料、热电器件的原理及发展历史,从材料及结构两方面,对基于微机电系统加工工艺的微型热电致冷器的最新研究进展进行综述,比较不同材料及不同结构的性能特点,对块体热电材料和低维热电材料的研究进展进行介绍,着重分析超晶格薄膜材料及Cross-Plane型器件,指出研究具有更高优值系数的新型材料,在维持Seebeck系数不变的同时提高电导率并降低热导率,及采用新的加工工艺优化致冷器的结构,减小接触电阻、接触热阻等,是提高热电致冷器性能的有效手段。     

喹啉梓有机电致发光薄膜器件的时间特性分析

用喹啉锌作发光材料,制备出Ｇｌａｓｓ／ＩＴＯ／Ｚｎｑ２／Ａ１结构的有机电致发光薄膜器件,分析并测量了它的伏安时间特性,电光时间特性,并与ＬＥＤ器件的电致发光时间特性进行了比较。实验表明有机薄膜发光的电光时间效应与ＬＥＤ器件相比有其特殊性。     

喹啉锌有机电致发光薄膜器件的时间特性分析

用喹啉锌（Ｚｎｑ２）作发光材料,制备出Ｇｌａｓｓ／ＩＴＯ／Ｚｎｑ２／Ａ１ 结构的有机电致发光薄膜器件,分析并测量了它的伏安时间特性,电光时间特性,并与ＬＥＤ器件的电致发光时间特性进行了比较。实验表明有机薄膜发光的电光时间效应与ＬＥＤ器件相比有其特殊性。     

有机电致发光薄膜器件的研究

有机电致发光薄膜具有制备方便,驱动电压低,发光亮度高,可以与聚合物基底匹配等优点,成为目前世界显示技术的一大研究热点。论述了有机发光薄膜器件的结构、工作机理及其薄膜电致,光致发光的特性,论述了薄膜发光器件的电学特性与光学特性及其器件在脉冲电压波形驱动下的电光特性,提出了应用于显示技术的有机电致发光薄膜器件的电学于光学特性的优化方法。     

腔倒空器驱动器及其与声光调制器阻抗匹配问题的研究

本文根据微微秒激光器系统的技术要求, 讨论了腔倒空器驱动器的设计问题.设计了为测量声光调制器电等效输入阻抗而建立的超高频阻抗测量系统.针对目前驱动器与声光调制器阻抗匹配尚未很好解决的问题, 研究了结合声光调制器件的特性进行匹配网络设计的过程, 给出相应的CAD通用程序.得到了较理想的匹配结果.     

有机电致发光薄膜器件的研究

有机电致发光薄膜具有制备方便,驱动电压低,发光亮度高,可以和合物基底匹配等优点,成为目前世界显示技术的一大研究热点。论述了有机发光薄膜器件的结构、工作机理及其膜电致发光薄膜电致,光致发光的特性,论述了薄膜发光器件的电学科技司与光学特性及其器件在脉冲电压波形驱动下的电光特性,提出了应用于显示技术的有机电致光薄膜器件的电不于光学特性的优化方法。     

一种基于光时域展宽技术的高速ADC研究

提出了一种基于光学时域展宽技术的高速ADC的设计方案,利用光学的方法将快变信号在时域上进行有效的时间拉伸,从而降低了系统对后端电子ADC的技术要求,实现了对快变信号的超快测量.利用推挽式电光调制器的对称性来消除信号电光调制时的二次失真,再利用包络去除方法来减小信号幅值的失真度,从而实现被测信号的准确恢复和重建.通过理论...     

用于纳米光电子器件加工的纳米金属膜的制作

在利用Top-Down方式加工纳米电子器件和纳米光电子器件的研究中,纳米薄膜的制作和加工技术是一个关键环节.采用金属Ti-SOS结构的纳米器件,Ti膜的厚度和成膜质量成为影响基于AFM针尖诱导氧化加工Ti纳米氧化线/电路图形结构质量的重要因素.文中叙述了Ti膜的制备和检测方法,给出了纳米Ti膜的制备和在一定环境下对其进行氧化加工的结果.     

用喔星锌作发光层的有机电致发光薄膜器件的研究

用喔星锌（Ｚｎｑ２）作发光材料，做出Ｇｌａｓｓ／ＩＴＯ／Ｚｎｑ２／Ａｌ结构的有机电致发光薄膜器件，测量了它的伏安特性，电光特性曲线及其电致发光光谱，同时也测量了喔星锌在粉末和薄膜状态下的荧光光谱、激发光谱、吸收光谱。     

Waveguide electro-optic modulators based on self-assembled material systems

1Introduction Organicmaterialshaveadvantagessuchas lowerdispersion,highermodulationfrequency,andlowerpowerofoperationcomparedwithin organicmaterialsforapplicationinelectro optic(EO)devices[12].Thereareseveralgroupswho havereportedthefabricationofpoledpolymer basedEOmodulators.Electro opticcoefficients higherthanthoseoflithiumniobatehavebeena chievedwithmicrostructuralacentricityofthe polymericmaterialsbyapplicationofanexternal electricpolingfield[3].Anotherapproachfor fabricatingnonlinearwav…     

Phase-perturbation-free measurement of electro-optic effect based on Mach-Zehnder interferometer

A novel method of evaluating the electro-optic (EO) effect is proposed based on a Mach-Zehnder interferometer, where the interference fringes are perturbed by air turbulence and/or other mechanical vibrations of an optical bench. The method enables the practical and industrial measurement of the EO coefficient in any environment. It also provides the continuous or repetitive measurement, leading to evaluation of temporal change of an EO coefficient or orientation relaxation of an EO-chromophore containing polymer poled by an electric field.     

光学仿真算法的CAD系统实现

随着光电子集成和各种平面波导器件的集成度、复杂度越来越高以及光器件的结构越来越精密,用解析的方法对器件进行分析和设计已经无法实现。为实现光学器件的良好设计,以有限差分光束传播法（FD-BPM）为仿真算法开发了光学芯片仿真软件,实现了光波导器件的模拟仿真。由该仿真结果与Matlab仿真结果的对比可知,该仿真软件能达到显示波导状态的基本要求。     

Nanosecond square high voltage pulse generator for electro-optic switch

A scalable square high voltage pulse generator, which has the properties of fast rise time, fast fall time, powerful driving capability, and long lifetime, is presented in this paper by utilizing solid state circuitry. A totem-pole topology is designed to supply a powerful driving capability for the electro-optic (EO) crystal which is of capacitive load. Power MOSFETs are configured in series to sustain high voltage, and proper driving circuits are introduced for the specific MOSFETs configurations. A 3000 V pulse generator with ~49.04 ns rise time and ~10.40 ns fall time of the output waveform is presented. This kind of generator is desirable for electro-optic switch. However, it is not specific to EO switch and may have broad applications where high voltage fast switching is required.     

面向太赫兹应用的平面结构聚合物电光传感器

自由空间电光取样技术是太赫兹波(THz)相干探测的典型方法,电光传感器是其中的核心器件。传统的电光传感器多采用无机电光晶体材料,但是这种材料电光系数低并存在声子吸收性,致使太赫兹波的探测带宽受到限制。主-客体结构的电光聚合物材料具有较大的电光系数和较低的介电常数,近年来成为各国学者研究的热点。然而这种材料的主客体之间相容性差,极易产生相分离,导致电光性能降低,限制了材料的更广泛应用。采用一种化学与物理手段相结合的方法,将两种电光分子引入聚合物体系,制备了具有双电光分子的聚磷腈材料。这种材料不但具备良好的相稳定性,而且具有良好的电光性能,电光系数可达64.8 pm/V。基于双电光分子聚磷腈材料,设计并制作了具有平面结构的聚合物电光传感器。与传统的三明治结构电光传感器相比,平面结构传感器可以将探测幅度提升55%,光谱灵敏度提升35%,同时还可以避免入射角度对探测灵敏度的影响、降低噪声干扰、简化实验过程,是面向太赫兹应用的更适合器件。     

真空热处理对硫化锌薄膜光学与微结构特性的影响

针对电子束蒸发离子辅助沉积的硫化锌薄膜,研究了550℃以下真空热处理对其光学与微结构特性的影响。薄膜光学和微结构特性的测试分析表明:制备后薄膜为类立方结构的ZnS,在337.5nm波长处出现临界特性转折点,随着热处理温度的增加,转折波长两侧的消光系数变化规律相反,折射率和物理厚度呈现下降趋势,薄膜的禁带宽度逐渐增加;在红外波段的薄膜折射率与热处理温度的变化并不显著,在350℃下热处理时消光系数出现转折,主要是由晶粒变小的趋势所致;通过晶相分析,硫化锌薄膜经历了类立方结构到六方结构的转换,与禁带宽度的变化趋势基本一致。分析结果表明,光学特性变化的根本原因是薄膜的微结构特性变化。     

Ring crack propagation in silicon nitride under rolling contact

Silicon nitride has been found to have the optimum combination of properties which are suitable for rolling element bearing applications to withstand high loads, severe environments, and high speeds. Surface ring cracks are difficult to detect but are found on the surface of silicon nitride balls. These ring crack defects decrease the rolling contact fatigue life considerably. This paper presents an experimental study and numerical analysis of ring crack propagation in rolling contact. The contribution of this study is to provide understanding of ring crack propagation behaviour and life prediction in rolling contact. Rolling contact tests are performed on the silicon nitride/steel elements. Silicon nitride ball surfaces are examined before testing using a dye-penetrant technique and optical microscopy. The surfaces are examined using optical microscopy and scanning electron microscopy during testing and after failure. The numerical calculations are based on a 3D model of ring crack growth. The rolling contact loading is simulated by a repeated Hertzian surface load with normal pressure and tangential traction. Fracture mechanics analysis is utilised to determine the stress intensity along the crack front and the stress intensity factors are analysed using a 3D boundary element model. Life predictions from the present calculations are in line with the experimental observations.     

Nanometer profile measurement of large aspheric optical surface by scanning deflectometry with rotatable devices: Uncertainty propagation analysis and experiments

High-accuracy mirrors and lenses with large dimensions are widely used in huge telescopes and other industrial fields. Interferometers are widely used to measure near flat surfaces and spherical optical surfaces because of their high accuracy and high efficiency. Scanning deflectometry is also used for measuring optical near flat surfaces with sub-nanometer uncertainty. However, for measuring an aspheric surface with a large departure from a perfect spherical surface, both of these methods are difficult to use. The key problem for scanning deflectometry is that high-accuracy autocollimators usually have a limited measuring range less than 1000″, so it cannot be used for measuring surfaces having a large slope. We have proposed a new method for measuring large aspheric surfaces with large slopes based on a scanning deflectometry method in which rotatable devices are used to enlarge the measuring range of the autocollimator. We also proposed a method to connect the angle data which is cut by the rotation of the rotatable devices. An analysis of uncertainty propagation in our proposed method was done. The result showed that when measuring a large aspheric surface with a diameter over 300 mm and a slope of 10 arc-deg, the uncertainty was less than 10 nm. For the verification of our proposed method, experimental devices were set up. A spherical optical mirror with a diameter of 35 mm and curvature radius of 5000 mm was measured. The measuring range of the autocollimator was successfully enlarged by our proposed method. Experimental results showed that the average standard deviation of 10 times measurement was about 20 nm.     

How light gets through periodically nanostructured metal films: a role of surface polaritonic crystals

The physical origin of the enhanced optical transmission of periodically structured films related to surface plasmon polaritons is discussed from first principles. The enhancement of transmission through smooth, randomly rough and periodically nanostructured films is considered. Analysis shows that any metal (or dielectric) nanostructured film can exhibit enhanced transmission in certain spectral ranges corresponding to surface plasmon (or phonon) polariton Bloch mode states on a periodic structure. Resonant tunnelling via these states is responsible for the transmission enhancement. The properties of surface polaritonic crystals are analogous to those of photonic crystals and can find numerous applications for scaling down optical devices to nanometric dimensions as well as for designing novel nanostructured materials whose optical properties are determined by surface polariton interaction in a periodic structure.     

16Mn钢焊接件疲劳裂纹扩展的微观特征研究

研究了在循环载荷作用下,16Mn钢焊接件疲劳裂纹的扩展情况.通过光学显微镜观察了裂纹扩展的微观特征,发现了裂纹在焊接结构不同部位的扩展路径方式并分析了显微组织对裂纹扩展的影响.裂纹在母材处为穿晶扩展,在热影响区和焊缝金属中的扩展为穿晶和沿晶混合型.