一种新型宽波段无源光电干扰介质-水基泡沫

采用傅里叶变换红外透射光谱法和毫米波反射截面及透射率法,研究了水基泡沫的电磁波衰减性能。试验研究发现,少量的泡沫即可导致较小的红外3~5 μm、8~14 μm波段和8 mm波透过率：3~5 μm波段红外消光系数75%以上大于1.0 m2·g-1,而8~14 μm波段红外消光系数均大于 0.6 m2·g-1;8 mm波雷达反射截面积(RCS)平均约为0.302 9 m2。泡沫具有良好的衰减性和特殊结构,加立其水溶性、易配性、良好的流变性和经济性等优点,可以认为：水基泡沫是一种极具研究潜力的新型宽波段无源光电干扰介质。     

膨胀石墨红外消光性能研究

膨胀石墨是一种新型多波段无源干扰材料.为测试膨胀石墨红外消光性能,在分析烟幕消光机理的基础上,利用烟箱测试了膨胀石墨烟幕对3～5 μm、8～12 μm两个波段红外的透过率与时间的关系曲线,用滤膜称重法测量了膨胀石墨烟幕在不同时刻的质量浓度,计算了膨胀石墨烟幕在两个红外波段的平均质量消光系数,分别为0.8013 m<'2...     

太赫兹技术在烟尘与风沙探测中的应用

提出了利用波长更长的太赫兹波进行低能见度条件下的探测.从理论上计算对比了石墨材料对1.06μm、3～5 μm、8～12 μm以及337 μm波长或波段的消光性能(以质量消光系数(MEC)为例),发现石墨对337 μm波长的质量消光系数比前三者的低1～3个数量级;进行了实验测量,获得了337μm太赫兹波对一定浓度条件下石墨(模拟烟尘)和尘土的透过率,并以此计算得到其质量消光系数,发现石墨对337μm波长的质量消光系数比对1.06μm、10.6 μm波长的测量值低2个数量级.实验对比表明:337 μm太赫兹波具有较强的穿透烟尘和风沙的能力,能够弥补传统红外探测系统的不足,对生活生产、安全检查以及反恐等方面均具有潜在的应用价值.     

水基泡沫消光特性实验研究（特约）

水基泡沫在光电对抗隐身等领域有着广泛的应用，但现有光电干扰隐身技术存在作用时间短、干扰波段单一、污染环境等问题，难以有效对抗双模、多模精确制导武器。针对上述问题研究水基泡沫配方，开展了新型水基泡沫对可见光、红外（3～5 μm、8～14 μm）、激光（1.06 μm, 10.6 μm）、毫米波（3 mm, 8 mm）和厘米波（2 cm, 3 cm）的消光性能实验以及水基泡沫对8～14 μm波段热像遮蔽干扰效应测试，讨论了水基泡沫消光机理，指出以水基泡沫形成泡沫云或使之与人工雾复合构成幕障，有望获取一种“宽频谱”、“全波段”、“环保型”的新型烟幕武器装备。     

炭/铁磁体复合材料红外干扰性能

制备了纳米炭球、炭/铁磁体和炭基/铁磁体的红外烟幕材料,采用傅里叶变换红外光谱仪的KBr压片法测试了其在波长2.5～25μm区间的红外透过率,根据朗伯-比尔定律计算了质量消光系数.结果表明:与传统的乙炔黑等炭质红外衰减材料相比,纳米炭球的红外消光性能优异,在2.5～11.95 μm波段的质量消光系数均大于0.3 m2/...     

根据Mie氏理论对单个泡沫球的体积消光性能的研究

;为寻求光学多波段干扰的有效途径,研究了泡沫这种新型环保长效的宽波段干扰介质.采用Mie氏理论,计算分析了在不同泡沫溶液复折射率情况下,在军事上两种常用激光波长(1.06μm、10.60μm)处和红外波段(3μm～5μm、8μm～14μm)以及可见光波段(0.38μm～0.76μm)内单个泡沫球的体积消光性能与泡沫球尺寸和壁厚的关系.计算分析结果表明,在不同的波长处或波段内,具有不同泡沫溶液复折射率的最优泡沫球体积消光系数所对应的泡沫球尺寸及壁厚是不同的.     

石墨烯烟幕红外激光消光性能研究

石墨烯片具有质轻、层薄、比表面大的优点,满足烟幕材料所需的要求.为了探索石墨烯在干扰红外成像制导武器方面的应用,利用20m3烟箱,通过快速热引爆石墨烯原材料获得烟幕的方法,测试了烟幕在1.06 μm激光的透过率曲线以及8～14μm波段的红外图像的遮蔽特性,获得了烟幕对1.06μm激光和8～14μm红外波段的平均质量消光系数均在2.0 m2.g-1以上,对红外光具有显著的干扰效果.分析了烟幕粒子的扫描电子显微图像、透射电镜图和X射线衍射图谱,结果表明所制备的烟幕粒子为石墨烯片组成,石墨烯烟幕粒子的微观结构有利于对红外光的吸收和散射.     

雾状油遮蔽性能研究

文章使用Mie散射理论,对粒径服从对数正态分布的雾状柴油的质量消光系数及其在可见光(0.3～0.8 μm)、中/长波红外大气窗口(3～5 μm和8～14 μm)的平均质量消光系数进行了计算.研究了粒径分布参数对雾状油遮蔽性能的影响,结果表明当r0与被遮蔽(波段)波长接近且b0趋于1时,(波段平均)质量消光系数具有最大值.最后通过实验,研究了冷凝型雾状油(柴油)在以上三个波段的遮蔽性能,实验结果表明其对可见光具有较强的遮蔽作用,对远红外的遮蔽作用最弱,实验结果与理论分析相一致.     

纳米银粉的红外消光特性研究

在容积为20m3的烟箱中分别喷撒30g纳米银粉,通过测量其在不同时刻的激光透过率和烟幕质量浓度,测得纳米银粉对1.06μm近红外和10.6 μm远红外激光的质量消光系数分别为1.833 m2·g-1和1.474 m2·g-1;利用红外热像仪测试了纳米银粉在8～12μm波段对靶标红外热像的遮蔽效果.结果表明,纳米银粉对双波长红外激光系统、红外热像仪均具有显著的干扰作用,是一种极具潜力的宽波段烟幕干扰材料.     

微米铜粉对红外、10.6 μm激光的衰减性能研究

为选择一种能够遮蔽红外与激光的烟幕干扰材料,在烟幕箱中测试了组分配比不同的微米铜粉的红外与10.6 μm激光烟幕透过率,当烟幕浓度为1.0 g·m-3时,1~3 μm,3~5 μm,8~14 μm红外的透过率均小于30%,10.6 μm激光的透过率小于20%,红光铜粉、青红光铜粉和青光铜粉对红外与10.6 μm激光的衰减能力逐渐增强;同时测试了微米铜粉对红外热像仪的干扰效果,浓度为2.0 g·m-3时,青光铜粉能够完全遮蔽红外热像仪。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.