高分子p—n异质结太阳电池的研究

用合成的十二烷基苯磺酸（ＤＢＳＡ）掺杂的聚苯胺（ＰＡｎ）导电材料和Ｂｅｉ染料组合，采用涂覆技术，研制成ＳｎＯ２／ＰＡｎ膜／Ｂｅｉ染料薄层／Ａｌ栅电极结构和Ａｌ／ＰＡｎ导电基片／Ｂｅｉ染料薄层／Ａｌ栅电极结构的ｐ－ｎ异质结太阳电池，测定了该电池的光电效应和伏安特性，在４．７２ｍＷ／ｃｍ＾２的氙灯照射下，开路电压Ｖｏｃ达４００ｍＶ短路电流Ｉｓｃ为１０μＡ，填充因子可达５７．４％，光电转换效率为０．０９     

IBAD薄膜与基体界面的显微结构

采用中能离子束辅助沉积（ＩＢＡＤ）技术，在单晶Ａｌ２Ｏ３（０００１）基片上沉积Ｍｏ膜，在ＧＡＡｓ（００１）基片上合成Ｆｅ１６Ｎ２薄膜，用ＨＲＥＭ等研究了Ｍｏｅａｊｄ－Ａｌ２Ｏ３（０００１），Ｆｅ１６ｎ２膜－ＧａＡｓ（００１）界面的显微结构，结果表明：Ｍｏ膜的晶粒呈细小柱状或纤维状，晶粒平均尺寸约８ｎｍ，Ｆｅ１６Ｎ２薄膜为等轴晶，晶粒平均尺寸约为１０ｎｍ，在Ｍｏ膜－Ａｌ２Ｏ３（０００１）界面及Ｆｅ１     

自适应声干扰抵消系统

随着视听设备本身的复杂程度日益上升，利用语音进行人机直接对话就越来越变得可能与必要。就语音识别本身而言，目前已能采用一、两片大规模集成电路芯片实现对高信噪比的孤立词的识别。但是当存在干扰与噪声时，其识别准确性将大幅下降。语音系统的输入ｘ（ｎ）由ｓ（ｎ）、ｎ（ｎ）、ｕ（ｎ）三部分组成。其中：ｓ（ｎ）是控制命令语音信号，ｎ（ｎ）是视听设备使用环境中的噪声，一般比较小，可以忽略不计。ｕ（ｎ）来自视听设备，可以将其视作一个已知干扰，因而可以采用声干扰抵消系统抵消其直达声分量以及部分混响声。若利用抵消系统…     

碾压混凝土拱坝施工温度仿真分析在Ansys软件上的实践

本文用Ａｎｓｙｓ通用软件中的有关功能，加以合理整合，进行了体型复杂的碾玉混凝土拱坝施工期的温度仿真计算，对Ａｎｓｙｓ软件在这方面的应用，提供了一个成功的范例。     

影响Sol—gel法制SnO2膜的因素及膜特性

Ｓｎ（ＯＣ２Ｈ５）４是制ＳｎＯ２膜的前驱体之一，本文报道控制形成溶胶的Ｓｎ（ＯＣ２Ｈ５）４水解条件，水解产物ｐＨ值（≤３）及粘度等，研究了水解产物的热分解过程及膜的某些特性，包括得到较佳ＳｎＯ２膜的合家热处理温度和加温速率，若干掺杂剂，电子束辐照及衬底加热温度对膜材的电学参数的影响，测定了涂膜后光纤的弯曲断裂强度与此类膜的气敏特性。     

Ge／Pd／n—GaAs低阻欧姆接触的SIMS分析

采用Ｇｅ／Ｐｄ／ＧａＡｓ结构和快速热退火在ｎ－ＧａＡｓ上形成了低阻欧姆接触，利用二次离子质谱技术揭示和讨论了低欧姆接触形成的机理。比较了采用Ｘ＾＋和ＧｓＸ＾＋信号检测的Ｇｅ，Ｐｄ，Ｇａ和Ａｓ的深度分布。结果表明采用ＣｓＸ＾＋可以提供更准确的结果和成分信息。     

PECVD法制备的SnOx气敏膜的色变机理

有用ＰＥＶＣＤ法制备了非晶掺Ｓｎ有机膜，经过退火处理得到ＳｎＯｘ气敏膜，考察了退火过程和气敏响应过程的阻温特性和颜色变化的关系，研究了表面掺Ａｇ对ＳｎＯｘ元件电阻、     

PECVD生长nc—Si：H膜的沉积机理分析

ｎｃ－Ｓｉ：Ｈ膜具有显著不同α－Ｓｉ：Ｈ与μｃ－Ｓｉ：Ｈ膜的新颖结构与物性。从热力学反应的基元过程出发，定性地分析了本征ｎｃ－Ｓｉ：Ｈ与掺磷ｎｃ－Ｓｉ（Ｐ）：Ｈ膜的沉积机理，并提出了进一步改善膜层质量的新途径。     

Sn—SnOx薄膜的组织结构及湿敏性

报道了一种制备Ｓｎ－ＳｎＯｘ湿敏薄膜的新工艺（ＶＥＴＯ）。首先在１ｍＰａ的真空下蒸发纯金属Ｓｎ质量分数９９９ｍｇ·ｇ＾－１，衬底温度控制在１５０￣２５０℃，蒸发的Ｓｎ膜在空气中缓慢氧化，即可获得湿度敏感的Ｓｎ－ＳｎＯｘ薄膜，利用ＸＲＤ和ＳＥＭ分析了膜的晶体结构和表面形貌，环境温度ＲＨ从１０％变到９７％时，膜阻抗变化的三个量级，膜电导是电子电导和离子电导的混合，在低湿区电子电导是主要的，在高湿区离子     

得分向量偏序集上Schur函数和奇异得分向量

所有ｎ维得分向量集合Ｌｎ在优超关系下是一个偏序集。Ｌ上的实函数ｇ（ｓ）称为（严格）Ｓｃｈｕｒ凸的，若对任意ｓ，ｓ′∈Ｌｎ，ｓ≠ｓ′，ｓ优超ｓ，恒有ｇ（ｓ）≥（〉）ｇ（ｓ）。本文证明了ｆ（ｘ）＝ｓ＾Ｔｓ和得分向量为ｓ的竞赛图Ｔｎ中３－圈个数ｃ３（ｓ）在Ｌｎ上分别是严格Ｓｃｈｕｒ凸和严格Ｓｃｈｕｒ凹的，称ｎ维得分向量ｓ为奇异的，若得分向量为ｓ的每个ｎ阶竞赛图Ｔｎ的邻接矩阵都是奇异的。最后，应用Ｌ上严格     

高精度光纤延迟线的研究

针对光纤延迟线的高精度的要求,基于光开关和光纤,设计了光纤延迟线的拓扑结构,分析了光纤连接误差和光开关误差对延迟线精度的影响,本文提出了一种减小光开关状态误差的方法.在Matlab的环境下,计算出所有可能的拓扑结构以及相对应的误差值.通过设定条件选出最小的误差值所对应的拓扑结构,并用于高精度光纤延迟线的设计.仿真证明,采用优化的拓扑结构,当开关误差小于1 ps时,延迟误差优于2 ps.用磁光开关和单模光纤构建了5 bit光纤延迟线,经过测量,实验结果表明当步进为100 ps时,误差优于2.98 ps.     

Random Sampling Oscilloscope for the Observation of Mercury Switch Closure Transition Times

With the advent of new miniaturized mercury (Hg) switches with reputed transition times of the order of 10 ps, interest has been rekindled in their use in high-peed pulse measurements. Since there is no pretrigger signal available from a Hg switch, normal sequential sampling techniques are not useable to measure the fast Hg switch transition time. For this reason, a new random sampling time base unit was designed to perform these measurements at the low repetition rate of Hg switches. The time base may be used with commercial sampling oscilloscope systems through suitable interconnection terminals or possible interface equipment. It features three selectable time windows of 1 jus, 100 ns, and 10 ns. Using its time magnifier, the fastest sweep rate is 10 ps/cm. A variable trigger lead time control is provided. The trigger sensitivity is 5 mV.     

Simple nanosecond to minutes transient absorption spectrophotometer

We built a transient absorption spectrophotometer that can determine transient absorption spectral changes that occur at times as fast as approximately 200 ns and as slow as a minute. The transient absorption can be induced by a temperature-jump (T-jump) or by optical pumping from the deep ultraviolet (UV) to the infrared (IR) by use of single ns Nd:YAG laser pulses. Our use of a fiber-optic spectrometer coupled to a XeF flashlamp makes the collection of transient spectra easy and convenient in the spectral range from the near IR (1700 nm) down to the deep UV (200 nm), with high signal-to-noise (S/N) ratios. The spectral resolution is determined by the specific configuration of the fiber-optic spectrometer (grating groove density, fiber diameter, slit width) and varies between 0.3 and 10 nm. The utility of this spectrometer was demonstrated by measuring the rate at which a polymerized crystalline colloidal array (PCCA) of poly(N-isopropylacrylamide) nanogel particles optically switch light due to a T-jump induced by nanosecond 1.9 microm laser pulses. In addition, we measured the rate of optical switching induced by a 3 ns 355 nm pump pulse in PCCA functionalized with azobenzene.     

一种可扩展的双层光互连网络设计与分析

本文设计一种具有可扩展性的双层并行光互连网络.顶层为数字路由结点和光网络接口卡组成的星型网,底层为光网络接口卡连接而成的环形网.结点机以及数字路由结点影响网络的性能.结点机的吞吐能力限制了整个网络的吞吐率;扩展PCI总线的位数能够提高光网络接口卡的吞吐速率,采用64bit/66MHz工作模式可获得4.224 Gbps峰值传输速率.网络的实际最大吞吐速率为8.448Gbps,环网内平均延迟2195ns,环网间平均延迟4713 ns.可以采用本文设计的数字路由结点对网络进行低成本级联扩展,扩展后网络性能显著提高.     

Design and analysis of hybrid optical and electronic buffer based optical packet switch

Optical packet switching has the potential to be used as next generation data transfer technology. This paper, introduces an Arrayed Waveguide Gratings (AWG) switch where hybrid buffer (electronic + optical) is used for the buffering of contending packets. Power budget analysis has been carried out under various switch designs. Comparison of optical and electronic buffering is done in terms of power required for the correct operation of the switch. Energy consumption per bit is also evaluated for both optical and electronic buffers for various buffering time ranges from nano-seconds to milli-seconds. In the switch analysis it has been found that, amplified switch requires five times less power, in comparison to un-amplified switch for correct operation. Energy consumption analysis reveals that for shorter duration storage, optical buffer would be a better choice.     

Optical signal inverter of erbium-doped yttrium aluminum garnet with red shift of laser diodes

An optical signal inverter was demonstrated in a simple structure that combined a laser diode with Er-doped YAG crystal. The optical signal inversion occurred at a response time of 7 ns and was caused by the decrease of transmission of Er:YAG against the red shift of the wavelength of the laser diode.     

Integrated liquid crystal optical switch based on double teeth-shaped structure at telecom wavelengths

The characteristics of a double teeth-shaped plasmonic optical switch are analyzed. Based on the metal–insulator–metal waveguide consisting of double rectangular teeth, a nanoscale liquid crystal optical switch is proposed and numerically simulated by using the finite difference time domain method with a perfectly matched layer absorbing boundary condition. It is found that the double teeth-shaped structure filled with liquid crystal can realize the function of a switch. The modulation depth of the double teeth-shaped structure is larger than 50?dB.     

Development of picosecond time resolution optical and X-ray streak cameras

We describe the development of an optical and an X-ray streak camera with picosecond time resolution. The entire peripheral electronics and testing systems have been developed indigenously. Both the streak cameras provide ∼ 15 mm/1 ns streak rate with a sweep voltage of ∼ 1 kV amplitude and rise time of 1 ns. The time and spatial resolution of the optical streak camera have been found to be ∼ 17 ps and 100 μm respectively. The sweep pulse generator developed for this purpose provides a step pulse of rise time ≦1 ns and amplitude ∼ 2 kV. The laser diode used for testing the optical streak camera provides multiple pulsation when the pump current is increased beyond a critical threshold.     

Polymer-based waveguides and optical switching

The fabrication and linear optical characterization of a Bragg reflector in a planar polymeric waveguide, suitable for an all-optical switching device, is reported. Surface corrugation gratings with a grating constant of 349 nm were produced in different polymeric films of poly(phenylene-vinylene), polydiacetylene and polystyrene by excimer laser photoablation. Furthermore, the gap in the linear transmission spectrum of the modulated waveguide was measured and compared with the result of numerical simulations. A good agreement can only be found if a non-uniform grating with a small chirp is assumed. This small deviation from the uniform grating cannot be resolved with a scanning electron microscope. However, this linear optical investigation helps to further improve the fabrication process and opens the possibility to yield a well-defined grating with a prescribed modulation strength, which is a vital requirement for the proper operation of a nonlinear all-optical switch.     

128×128 three-dimensional MEMS optical switch module with simultaneous optical path connection for optical cross-connect systems

A 128×128 three-dimensional MEMS optical switch module and a switching-control algorithm for high-speed connection and optical power stabilization are described. A prototype switch module enables the simultaneous switching of all optical paths. The insertion loss is less than 4.6 dB and is 2.3 dB on average. The switching time is less than 38 ms and is 8 ms on average. We confirmed that the maximum optical power can be obtained and optical power stabilization control is possible. The results confirm that the module is suitable for practical use in optical cross-connect systems.