有限光束穿过薄介质板的类Goos-Hnchen位移

研究了有限光束穿过薄介质板时透射光束存在类Goos-Hanchen位移、角偏转、束腰宽度的修正以及焦点的纵向移动4种非几何光学效应;给出了位移反向时入射角及介质板的厚度所需满足的必要条件;报道了利用微波技术首次在实验上观测到穿过薄介质板时波束的反向GHL位移.这些奇异的光学现象将在光学器件和集成光学中具有潜在的应用.     

有限光束穿过薄介质板的类Goos-H(a)nchen位移

研究了有限光束穿过薄介质板时透射光束存在类Goos-H(a)nchen位移、角偏转、束腰宽度的修正以及焦点的纵向移动4种非几何光学效应;给出了位移反向时入射角及介质板的厚度所需满足的必要条件;报道了利用微波技术首次在实验上观测到穿过薄介质板时波束的反向GHL位移.这些奇异的光学现象将在光学器件和集成光学中具有潜在的应用.     

光束在单层金属界面上反射时的纵向位移

光束在弱吸收介质板上反射时,会产生纵向位移。采用稳态相位法从理论上研究了线偏振光在单层金属界面上反射时的纵向位移。结果表明。在吸收频率区,TE偏振反射光束的纵向位移很小,随入射角增大单调增加,掠射时趋于饱和,而TM偏振反射光束的纵向位移为负位移,在入射角为80°附近达到峰值约λ;在反射频率区,TE反射光束的纵向位移随入射角的变化规律与在吸收频率区相同,饱和值更小,TM反射光束的纵向位移为负位移,掠射时约几个波长。     

光束反射中的若干新奇现象

本文对有限宽度的光束在两种不同光学性质的平面界面上反射中的若干新奇现象进行了系统的介绍．这里所说的反射中的新奇现象，指的是与经典几何光学反射定律不相一致的一切现象，主要介绍当光束从光密介质入射到光疏介质的界面上时的反射现象．本文就三种典型光束(平行光束、高斯光束与发散光束)的反射现象分述如下：     

圆形周期介质内艾里光束的传输特性

为了研究无衍射光波在特异材质内的传输特性，实现更优良的光波通信，将传统右手材料和双负折射率材料相结合，提出了一种轴向阶跃变化周期圆形介质结构。基于广义惠更斯-菲涅耳光学积分公式，结合光学传输矩阵，分析了艾里光束在这种传输媒质中出射表面光强分布特性和侧面传输光强分布图；分析了负折射率参量对这类光波演变的影响及其补偿机理；分析了实现输出光波完美还原时，负折射率大小同介质单元长度的定量关系。结果表明，当介质孔径逐渐减小时，有限艾里光束衍射效应越来越严重，并且出射光强外形轮廓逐渐从艾里光束过渡到高斯光束；当双负折射率材料的折射率n_l的绝对值大于右手材料的折射率n_r时，出射表面实现光波完美还原的双负折射率材料单元层越长，反之则越短。该研究对分析周期或准周期轴向阶跃变化的圆形平板介质光波通信是有帮助的。     

高斯光束与非线性介质限幅的数值分析

在强光与非线性介质相互作用的自作用效应中,自聚焦现象是人们研究的最为广泛的一种,并且还提出基于这种效应的光学双稳、限幅等器件原理。 在薄介质近似下,即介质厚度L比特征长度R_d=1/2k_0ω_0~2小的多时,有人研究了光束通过这样的非线性介质后被动限幅情况。在介质引起的相位改变|ΔΦ|?相似文献   

有偏压光伏光折变晶体中自加速光束交互效应的理论研究

采用分步傅里叶法理论探究了有限能量艾里光束和非线性加速光束在有偏压光伏光折变介质中的交互效应。结果表明:调节光束初始间隔和入射角度可使同相位或反相位有限能量艾里光束相互吸引或排斥。同相位时不仅产生呼吸孤子和孤子对，在适当参数条件下还可形成分叉孤子；反相位时仅有孤子对产生；同相位非线性切趾加速光束交互可以产生奇数个呼吸孤子，反相位非线性切趾加速光束交互可以产生偶数个呼吸孤子对。此外，呼吸孤子的峰值强度、呼吸周期和相互作用力的大小均可以通过外部偏压和入射角度进行有效调控。研究结果可为艾里光束交互调控提供理论基础，同时在全光信息处理和光学网络器件制备等领域具有潜在的应用前景。     

分划板失调对猫眼光学系统反射特性的影响

为了研究猫眼光学系统中分划板失调对入射光束的反射特性影响,考虑光学元件的等效光阑作用,将失调光阑孔径函数展开为有限项复高斯函数之和,利用失调光学系统的广义衍射公式,推导出入射光束经含分划板失调猫眼光学系统的反射光束场分布的近似解析式,得到反射光束场分布与入射光束光学参量、分划板孔径尺寸和分划板失调量之间的关系,对特定猫眼光学系统定量分析了分划板失调对反射光束场分布的影响。结果表明,分划板失调对反射光束场分布产生影响,特别是对远场光场分布影响显著。     

终端靶场中相位畸变对近场光束质量的影响

终端靶场聚焦系统中的光学元件上存在不可避免的缺陷致使光场波前发生畸变,根据高功率激光装置终端靶场系统中强光束传输的特点,建立了描述光学元件引入的局域相位调制的模型,研究了终端靶场中具有高斯型相位波前畸变的平顶光束经过透镜会聚,并在后续防溅射板等熔石英介质中经历非线性增长的传输演变过程,详细分析了高斯型相位波前畸变、熔石英厚度和透镜焦距对终端靶场聚焦系统中的近场光束质量的影响。结果表明,高斯型波前畸变越严重、熔石英厚度越长、透镜焦距越短,近场光束质量越差,中高频增长越多。     

偏心椭圆高斯光束

在椭圆高斯光束横坐标中引入复数偏移量,将其推广为偏心椭圆高斯光束。在垂直于ｚ轴截面内强度分布仍然是椭圆高斯函数分布,在传播方向上光束峰值强度沿直线分布,波前也存在横向位移。对偏心椭圆高斯光束经一阶光学系统的变换关系进行了定量推导。对传播方向偏离ｚ轴的椭圆高斯光束经薄透镜传播时的特例进行了讨论。     

Technology innovation and process integrations for sub-100nm gate patterning

This paper presents a brief overview of the Applied Centura(R)DPS(R)system,configured with silicon etch DPS Ⅱ chamber, with emphasis on discussing tuning capability for CD uniformity control. It also presents the studies of etch process chemistry and film integration impact for an overall successful gate patterning development. Discussions will focus on resolutions to key issues, such as CD uniformity, line-edge roughness, and multilayer film etching integration.     

White organic light-emitting devices based on fac tris（2- phenylpyridine） iridium sensitized 5,6,11,12-tetraphenylnap -hthacene

We have fabricated the white organic light-emitting devices （WOLEDs） based on 4,4＇ -bis（2,2 -diphenyl vinyl）-1,1＇ - biphenyl （DPVBi） and phosphorescence sensitized 5,6,11,12,-tetraphenylnaphthacene （rubrene）. The device structure is ITO/2T-NATA （20 nm）/NPBX （20 nm）/CBP： x%Ir（ppy）3：0.5% rubrene （8 nm）/NPBX （5 nm）/DPVBi （30 nm）/Alq（30 nm）/LiF（0.5 nm）/A1. In the devices, DPVBi acts as a blue light-emitting layer, the rubrene is sensitized by a phosphorescent material, fac tris （2-phenylpyridine） iridium [Ir（ppy）3], acts as a yellow light-emitting layer, and N,N＇ -bis- （1-naphthyl）- N,N＇ -diphenyl -1, 1＇ -biphenyl-4,4＇ -diamine （NPBX） acts as a hole transporting and exciton blocker layer, respectively. When the concentration of Ir （PPY）3 is 6wt%, the maximum luminance is 24960 cd/m^2 at an applied voltage of 15 V, and the maximum luminous efficiency is 5.17 cd/A at an applied voltage of 8 V.     

Complete approach to automatic identification and subpixel center location for ellipse feature

To meet the need of automatic image features extraction with high precision in visual inspection, a complete approach to automatic identification and sub-pixel center location for similar-ellipse feature is proposed. In the method, the feature area is identified automatically based on the edge attribute, and the sub-pixel center location is accomplished with the leastsquare algorithm. It shows that the method is valid, practical, and has high precision by experiment. Meanwhile this method can meet the need of instrumentation of visual inspection because of easy realization and without man-machine interaction.     

小角度扩展相关性近似算法分析

本论文提出一种在多天线MIMO信道相关性建模中小角度扩展近似理论算法,并应用于分析MIMO系统性能。分析中分别对三种不同角能量分布情况下的空间相关性研发快速近似计算法,并同时提出双模(Bi-Modal)角能量分布情况下的近似运算。通过分析这些新方法的近似效率,可以得到计算简单、复杂度低、而且符合实际的MIMO相关信道矩阵,对系统级的快速高效计算法的研究和系统级的评估以及误差分析具有重要的意义。     

A Versatile Mixed-Signal Pin Approach for Cost-Effective Test of Automotive ICs

Integrated circuits (ICs) intended for increasingly sophisticated automotive applications bring unique test demands. Advanced ICs for applications such as highly integrated automatic braking system (ABS) and airbag controllers combine high voltage digital channels, significant VI demands and precise timing capability. Along with continued missioncritical reliability concerns, the trend toward higher voltage operation and increased device integration requires specialized test capabilities able to extend across the wide operating ranges found in automotive applications. Among these capabilities, automotive test requirements increasingly dictate a need for a cost-effective versatile mixed-signal pin electronics with very high data rates reaching up to 50MHz with a voltage swing of-2 V to +28 V.     

Optical vibration and deviation measurement of rotating machine parts

It is of interest to get appropriate information about the dynamic behaviour of rotating machinery parts in service. This paper presents an approach of optical vibration and deviation measurement of such parts. Essential of this method is an image derotator combined with a high speed camera or a laser doppler vibrometer （LDV）.     

社长序言（英文）

正Happy New Year!As we step into a new year,we take a look back at the key feature topics covered in China Communications over the past 12 months and set out our expecta-     

Call for Papers

正Introduction Jointly sponsored by the China Institute of Communications(CIC)and the IEEE Communications Society(IEEE ComSoc)since the year 2013,China Communications,currently,is aiming to gradually realise the transition from journal to magazine content and style.     

INTEGRATION OF OPTICAL AND WIRELESS NETWORKS

正For a long time,optical and wireless systems/net-works are developed in separate communities witha few attempts for in-depth convergence.In fact,it prom-ises many advantages to combine the optical and wire-less technologies in the levels of systems and networks.Recently,both academia and industry have made manyefforts to enter a new phase of development to take op-tical and wireless systems as fully integrated networks.To provide high bandwidth and reliable service for bothfixed and mobile users,a well-designed network must     

Call for Papers—Feature Topic,Vol.12,No.3,2015

正Smart Grid Communications The electric power industry is undergoing profound changes as the industry aims to capture the promise of a smart grid for a sustainable energy future.Enabled by the advanced sensing devices such as Phasor Measurement Units(PMUs),increasingly powerful