激发态质子转移型有机分子7-羟基喹啉的光开关效应

本文研究了质子转移型有机分子７－羟基喹啉在皮秒激光脉冲作用下的光开关现象。实验结果表明７－羟基喹啉在３５５ｎｍ的皮秒光脉冲的作用下对４８８ｎｍ和６３２．８ｎｍ的光有明显的开关效应,而在５３２ｎｍ的皮秒光脉冲的作用下无此效应。产生开关效应的原因是由于７－羟基喹啉分子在激光态质子转移过程中生成的阳离子和阴离子具有较大的光学非线性。     

3-羟基黄酮的双光子吸收特性研究

3-羟基黄酮（3-HF）是一类具有激发态质子转移（ESPT）效应的有机分子，通过双光子诱导荧光研究了3-HF的ESPT的过程，并利用开孔Z-扫描的方法，在波长为532nm的皮秒脉冲激光激发下测量3-HF在环己烷溶液中的ESPT的双光子吸收系数。实验测得了在不同光强条件下的双光子吸收系数，结果表明，3-HF的双光子吸收系数随入射光强的增加而减小。这是由于在皮秒脉冲光的作用下，大量的3-HF分子被激发到激发态，而不能迅速返回，造成基态的粒子数不断减小，因此当光强增强时，双光子吸收系数减小。     

7-羟基喹啉二甲基亚砜溶液的光开关效应

研究了7羟基喹啉（7HQ）在二甲基亚砜（DMS）溶液中的全光光开关效应和激发态质子转移（ES-PT）效应。7HQ在与它能形成分子间氖键的溶剂中，在紫外光的激发下会发牛ESPT效应，使分子的构型发生变化，引起折射率也发生变化，是一种性能优良的全光光开关工作介质。DMS与7HQ不能形成分子间氢键，故7-HQ在DMS溶液中不能发生ESPT，不具有全光光开关效应。但实验发现，7-HQ的DMS溶液经强紫外光照射一段时间后出现了很强的光开关现象。比较了经强紫外光照射前后7-HQ的DMS溶液的吸收光谱和荧光光谱，报道了这一新现象并探讨了其产生的机理。     

新型光敏剂竹红菌甲素的强激光效应及电子激发态特性

有机功能分子在开发新型光电子材料和光动力疗法(PDT)光敏剂方面是一个重要的研究热点;竹红菌甲素(HA)分子属于激发态质子转移(ESIPT)型分子,具有丰富的激发态特性,且反应速度快,在新型激光染料和新型光电器件方面有一定的应用前景。观察了竹红菌甲素分子的激射现象,其发射激光的范围在620~800 nm;并利用激射效应的特点为强激光条件下的质子转移提供了进一步的依据。利用瞬态光栅技术研究了竹红菌甲素的电子激发态特性,把其瞬态光栅的超快过程归结为竹红菌甲素质子转移形成的过渡态TS*的衰减,并得出过渡态TS*瞬态光栅的寿命为10.5 ps。     

新型菁类化合物溶液的皮秒非线性光学性质

利用带相位物体的非简并泵浦探测方法测量了一种新型菁类化合物溶液在皮秒时域的非线性光学性质。在接近材料线性吸收峰值的532 nm皮秒激光脉冲泵浦下,利用600 nm的皮秒激光脉冲作为探测光,测量了菁染料分子在近共振区的非线性折射动力学响应。结合相关理论,通过数值模拟最终确定了菁染料分子在600 nm波段的光物理参数。实验结果表明:该溶液的非线性光学效应来自于溶质菁染料分子的激发态非线性机制,该材料具备了较大的激发态折射体积,且单重激发态的寿命较短。该化合物具备非线性光学应用潜力。     

HI分子的紫外和真空紫外光离解——H原子的激光光碎片光谱

用H原子的激光光碎片光谱法研究了HI分子在207nm、121.6nm和364.8nm的光离解动力学过程。通过测量H原子的平动能的分布,可得到激发的I~*(~2P3/2)原子的生成率。在207nm和121.6nm激光的光解下,分别生成25％±6％和73％±6％的激发态I~*原子。其中121.6nm激光的偏振度为79％,激发HI分子的平行跃迁,产生I~+原子。     

266nm激光下硝基苯的多光子电离解离研究

在266nm波长激光下,通过激光质谱仪获得气相硝基苯的共振增强多光子电离/飞行时间质谱（REMPI-TOFMS）。根据质谱图中出现的主要离子峰信息,对硝基苯的光解离过程进行了分析。硝基苯与266nm激光的作用过程为三光子过程,其首先吸收两个光子跃迁至激发态,一部分处于激发态的分子,因内转换导致结构重排,生成分子异构体。处于激发态的硝基苯分子或分子异构体共振吸收一光子后发生解离,并给出其可能的解离通道。     

富勒烯的功率光限幅特性

应用时间分辨技术研究了富勒烯溶液的激发态吸收瞬态功率光限幅特性,在实验条件下,其功率光限幅的开关速度约为5 ns.     

π共轭聚吡咯衍生物非线性响应时间的测量

合成一种新型π共轭聚吡咯衍生物———聚吡咯 { 2 ,5 二 [(对硝基 )苯甲烯 ]} (PPNB) ,制备了该高分子的N 甲基 2 吡咯烷酮 (NMP)溶液和聚乙烯醇 (PVA)复合薄膜。用 5 32nm ,8ns脉冲激光作抽运光源 ,氦氖激光 (6 32 8nm ,CW)为探测光源 ,测量了该高分子的非线性光学响应过程 ,测得PPNB/NMP溶液和PPNB/PVA薄膜的激光诱导折射率的建立时间分别为 4μs和 5 μs,恢复时间分别为 30ms和 5ms。引起这种非线性效应的机制可能主要是热光非线性效应。     

新型激光光源染料HA宽带调谐发光物理机制

为了研究和揭示竹红菌甲素(HA)的宽带调谐发光物理机制,采用强激光激发的方法,主要研究了HA的强激发辐射效应,从一个侧而证实了激发态质子转移(ESIPT)的存在,同时进行了理论分析和实验验证,并给出了HA分子能级模型.结果表明,对于HA分子需要舣光子吸收才能实现ESIPT过程.这一结果对进一步认识HA的发光物理机制是有...     

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.