高保真类金刚石／钛复合球顶高频扬声器振膜的研制

本文采用真空阴极电弧沉积方法在纯钛球顶场声器振膜基体上沉积类金刚石（ＤＬＣ）薄膜。研制成ＤＬＣ／Ｔｉ复合球顶振膜。着重讨论了钛基体的材质、厚度、振膜形状尺寸、ＤＬＣ镀膜工艺参数对复合振膜性能的影响，并讨论了在镀膜过程中采用辅助工夹具以及合理的遮挡技术，保证振膜不变形和最佳的ＤＬＣ膜层厚度与分布，使ＤＬＣ／Ｔｉ球顶复合振膜频响达３０ｋＨｚ。     

金刚石薄膜衬底表面不同预处理对薄膜表面形貌的影响

用微波等离子体化学气相沉积（ＣＶＤ）设备，在经过不同粒度的ＳｉＣ研磨粉进行粗化预处理过的金属钼衬底上沉积出了表面形貌有较大差异的金刚石薄膜，分别用扫描电子显微镜（ＳＥＭ）、光学显微镜和Ｘ射线衍射谱（ＸＲＤ）以及Ｒａｍａｎ光谱对样品进行了分析测试，并研究了各样品的场致电子发射特性。结果发现：在我们的实验范围内，对钼衬底研磨预处理所用的ＳｉＣ研磨粉的粒度越大，其上沉积出的金刚石薄膜样品的表面越粗糙；而金刚石薄膜的表面越粗糙，其场致发射的效果也越好。     

用于LCD的氧化铝阻挡层的射频反应溅射沉积及其特性

用金属铝靶射频反应溅射制备了Ａｌ２Ｏ３薄膜，用作ＬＣＤ基片玻璃的钠离子阻挡层。报道了射频溅射参数对薄膜沉积速率和折射率的影响。测试结果表明，所沉积的Ａｌ２Ｏ３薄膜满足ＬＣＤ器件阻挡层的要求。     

类金刚石薄膜的结构和红外光学性能研究

本文用辉光放电等离子体化学气相沉积(PCVD)法在Si、Ge玻璃等基片上制备出品质较好的类金刚石薄膜。首先,用拉曼光谱和红外吸收谱研究了所制备薄膜的结构,并且研究了制备膜的光吸收和光学带隙,然后,研究了沉积有类金刚石膜Si,Ge等基片的红外透过率。     

HFCVD方法沉积金刚石薄膜的生长研究

本文讨论了金刚石薄膜应用于光学领域所遇到的问题，研究了热丝ＣＶＤ（ＨＦＣＶＤ）方法生长应用于光学膜的金刚石薄膜过程中，衬底表面的预处理和沉积条件如碳源浓度、衬底温度等对制备腹晶粒尺度和晶粒间界以及膜表面形貌的影响．     

N离子轰击对纳米金刚石薄膜微观形貌的影响

用化学气相沉积 (ＣＶＤ)的方法制备出的金刚石薄膜具有很高的硬度和优异的耐磨能力 ,但在干摩擦过程中 ,金刚石薄膜经常造成摩擦对偶的严重磨损 ,使金刚石薄膜的应用受到一定的限制[1,2 ] 。本文用微波等离子体化学气相沉积的方法 ,先在单晶Ｓｉ(1 0 0 )片上制备出厚度为 40 0ｎｍ左右的纳米金刚石薄膜 ,然后采用高能Ｎ离子束轰击的方法 ,对纳米金刚石薄膜进行离子束轰击 ,以期达到改善金刚石薄膜摩擦性能的目的。实验用微波等离子体化学气相沉积 (ＭＷＣＶＤｍｉｃｒｏｗａｖｅｃｈｅｍｉｃａｌｖａｐｏｒｄｅｐｏｓｉｔｉｏｎ)的方法在单…     

掺N类金刚石薄膜的制备及微观结构分析

采用直流磁控溅射法,在光学玻璃衬底上沉积类金刚石(DLC)和掺N类金刚石薄膜(DLC:N)。用喇曼光谱、X射线光电子能谱(XPS)、傅里叶红外光谱(FTIR)等研究分析了所制备薄膜的微观结构。喇曼光谱的结果表明,掺N类金刚石膜仍具有典型的类金刚石膜结构,在类金刚石薄膜中掺N不仅有助于提高膜中sp3/sp2的比例,而且还能阻止sp2键向石墨相的转化,稳定并优化薄膜的类金刚石属性。FTIR表明,薄膜中N与C原子形成了C—N、CN及C≡N等键合方式。XPS谱表明,掺N类金刚石膜中除了C和N元素外,还出现了少量的O元素,而C1s和N1s的解谱显示,掺N后的类金刚石膜中的C、N结合能发生了明显的移动,由计算得出薄膜中N的含量为13.5%。薄膜的表面形貌图(AFM)表明,在类金刚石薄膜中掺N能够改善其表面形貌。     

金刚石薄膜-金属接触的SEM和XRD研究

用ＳＥＭ和ＸＲＤ研究了金刚石薄膜与双层金属之间的接触及界面性质，采用微波等离子体ＣＶＤ方法在Ｓｉ（１１１）基片上沉积了掺硼金刚石薄膜，然后蒸发上Ｔｉ／Ａｕ金属层，在氮保护气氛下７００℃热处理５０ｍｉｎ后获得一个线性的电流－电压特性，经ＳＥＭ和ＸＲＤ实验结果表明，Ｔｉ／Ａｕ金属与金刚石薄膜之间优良的接触性能的获得，显然是由于大金刚石膜－Ｔｉ／Ｔｕ界面处产生了ＴｉＣ新相以及ＴｉＣ的浸润性质的缘故。     

气相法制备金刚石的新进展

本文对气相法制备金刚石技术的新发展作了综述,同时介绍了自行设计的低压直流电弧等离子体喷射法装置,并对所制备的金刚石薄膜进行了拉曼光谱及扫描电镜的分析与评价。     

锗基底3～5μm和8～12μm双波段红外增透膜研究

文中简要叙述了双波段(3～5μm 和8～12μm) 红外增透膜的膜料选择以及锗基底上红外双波段增透膜的设计与镀制,介绍了离子束辅助沉积技术制备该薄膜的过程。提出了采用脉冲真空电弧离子镀技术镀制无氢类金刚石膜作为红外增透膜的保护膜,并讨论了镀制类金刚石膜后,镀膜元件的光谱特性。     

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.     

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

IntroductionNanoimprint Lithography is a well-acknowl-edged low cost, high resolution, large area pattern-ing process. It includes the most promising methods,high-pressure hot embossing lithography (HEL) [2],UV-cured imprinting (UV-NIL) [3] and micro contactprinting (m-CP, MCP) [4]. Curing of the imprintedstructures is either done by subsequent UV-lightexposure in the case of UV-NIL or by cooling downbelow the glass transition temperature of the ther-moplastic material in case of HEL…     

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.     

Influence of PVK ： NPB hole transporting layer on the characteristics of organic light-emitting devices

A doping system consisting of NPB and PVK is employed as a composite hole transporting layer （CHTL）. By adjusting the component ratio of the doping system, a series of devices with different concentration proportion of PVK ： NPB are constracted. The result shows that doping concentration of NPB enhances the competence of hole transporting ability, and modifies the recombination region of charge as well as affects the surface morphology of doped film. Optimum device with a maximum brightness of 7852 cd/m^2 and a power efficiency of 1.75 lm/W has been obtained by choosing a concentration proportion of PVK ： NPB at 1：3.     

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.     

Analysis of error performance on Turbo coded FDPIM

Due to variable symbol length of digital pulse interval modulation（DPIM）, it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation（FDPIM） method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.