集成光学亚微米光栅的原子力显微镜表征

集成光学亚微米光栅的原子力显微镜表征＊李燕徐迈（中国科学院激发态物理开放研究实验室，长春１３００２１）（中国科学院长春物理研究所，长春１３００２１）张玉书（集成光电子学国家重点联合实验室，长春１３００２３）ＢｕｒｇｅｒＪＰａｒｉａｕｘＯ（ＣＳＥＭＳｗ...     

制备波导光栅的相位掩膜技术

制备波导光栅的相位掩膜技术＊马少杰李燕徐迈林久令（中国科学院长春物理研究所，长春１３００２１）（中国科学院激发态物理开放研究实验室，长春１３００２１）关键词光波导，光栅耦合器，全息光栅自从７０年Ｄａｋｓｓ等人首次报道了集成光波导光栅器件以来［１］，波...     

ZnSe－CdZnSe多量子阱F－P腔光双稳器件的室温皮秒反射式激子光双稳

ＺｎＳｅ－ＣｄＺｎＳｅ多量子阱Ｆ－Ｐ腔光双稳器件的室温皮秒反射式激子光双稳栗红玉，申德振，张吉英，范希武，杨宝均（中国科学院激发态物理开放研究实验室，长春１３００２１）（中国科学院长春物理研究所，长春１３００２１）近年来，半导体超晶格的光双稳器件由于...     

藻蓝蛋白(C-Pc)的三阶光学非线性和激发态弛豫

藻蓝蛋白（Ｃ－Ｐｃ）的三阶光学非线性和激发态弛豫＊刘志斌彭俊彪ａ）李文连（中国科学院长春物理研究所，长春１３００２１）ａ）（中国科学院激发态物理开放研究实验室，长春１３００２１）邓湘君（吉林省生物研究所，长春１３００１２）关键词藻蓝蛋白，χ（３）值，...     

光助MOCVD生长ZnSe单晶薄膜

光助ＭＯＣＶＤ生长ＺｎＳｅ单晶薄膜＊赵晓薇范希武张吉英杨宝均于广友申德振（中国科学院长春物理研究所，长春１３００２１）（中国科学院激发态物理开放研究实验室，长春１３００２１）关键词光助ＭＯＣＶＤ，ＺｎＳｅ基半导体材料，辐照光强度蓝绿光发射二极管和激光...     

镉铝硅酸盐玻璃中Eu^3＋离子的荧光

镉铝硅酸盐玻璃中Ｅｕ３＋离子的荧光＊袁剑辉＊＊刘行仁＊＊＊林海王晓君（中国科学院长春物理研究所，长春１３００２１）（中国科学院激发态物理开放研究实验室，长春１３００２１）关键词Ｅｕ３＋离子，荧光，玻璃近年来，随着光纤通讯，上转换发光和激光，非线性光学...     

取向Kerr效应对液晶光控取向质量的影响

取向Ｋｅｒｒ效应对液晶光控取向质量的影响＊王淑梅ａ）梁兆颜闫石谢景力ｂ）田颜清ｂ）黄锡民ａ）（中国科学院激发态物理开放研究实验室，长春１３００２１）（中国科学院长春物理研究所，长春１３００２１）ｂ）（吉林大学化学系，长春１３００２３）关键词取向Ｋｅｒ...     

有机稀土Eu（DBM）3bath配合物电致发光

有机稀土Ｅｕ（ＤＢＭ）３ｂａｔｈ配合物电致发光＊梁春军李文连＊＊洪自若彭俊彪ａ）虞家琪ａ）赵丹赵东旭（中国科学院长春物理研究所，长春１３００２１）ａ）（中国科学院激发态物理开放研究实验室，长春１３００２１）关键词有机电致发光，稀土配合物，窄带发射近几...     

掺杂Cu^2的ZnS纳米超微粒的荧光衰减

掺杂Ｃｕ２＋的ＺｎＳ纳米超微粒的荧光衰减＊李丹刘俊业孟继武窦凯ａ）许武ａ）孙聆东ｂ）李振鹏ｂ）（中国科学院长春物理研究所，长春１３００２１）ａ）（中国科学院激发态物理开放研究实验室，长春１３００２１）ｂ）（北京大学稀土材料化学及应用国家重点实验室，北...     

ZnSe－ZnS量子阱的光学非线性

ＺｎＳｅ－ＺｎＳ量子阱的光学非线性张希清，范希武，申德振，杨爱华，陈连春，吕有明，陈一民（中国科学院长春物理研究所，长春１３００２１）半导体量子阱及超晶格材料具有室温激子效应以及强的光学非线性从而得到人们广泛的重视．利用半导体量子阱和超晶格可以制备出...     

Synaptic behaviors of a single metal–oxide–metal resistive device

The mammalian brain is far superior to today’s electronic circuits in intelligence and efficiency. Its functions are realized by the network of neurons connected via synapses. Much effort has been extended in finding satisfactory electronic neural networks that act like brains, i.e., especially the electronic version of synapse that is capable of the weight control and is independent of the external data storage. We demonstrate experimentally that a single metal–oxide–metal structure successfully stores the biological synaptic weight variations (synaptic plasticity) without any external storage node or circuit. Our device also demonstrates the reliability of plasticity experimentally with the model considering the time dependence of spikes. All these properties are embodied by the change of resistance level corresponding to the history of injected voltage-pulse signals. Moreover, we prove the capability of second-order learning of the multi-resistive device by applying it to the circuit composed of transistors. We anticipate our demonstration will invigorate the study of electronic neural networks using non-volatile multi-resistive device, which is simpler and superior compared to other storage devices.     

虚拟式声显微镜及应用技术研究

本文描述一台虚拟式扫描声显微镜及应用技术研究，它的硬件特别简单，仅由一台带有超高速A/D卡和快脉冲收发卡的PC机和机械扫描系统组成，主要的功能均由软件完成，脉冲收发卡仅包括脉冲产生和高频放大器，A/D卡采用PCI总线，采样率1GSPS，数据传输率100MB/s，系统能采集并实时显示频率达百兆的未检波回波信号，采修订本以的信号经软件处理，可在屏幕上实时显示样品的A、B、C型幅度像或相位像，仪器利用信号处理技术提高信号的信噪比；进行特征提取，识别，该仪器在材料识别，电子、光电子器件和焊接质量检测等方面功能较强，具有广阔的开发应用前景。     

A new method for determination of satellite orbits by transfer

The original idea of a new method for determination of satellite orbits by transfer is from Two-Way Satellite Time and Frequency Transfer (TWSTFT). The original method is called “determination of satellite orbit by transfer”. The method is not only for determination of satellite orbit but also for the time transfer with high accuracy and precision. The advantage is that the accuracy and the precision for determination of satellite orbit are very high and the new method is favorable for various applications. The combination of various signals disseminated and received forms various modes of satellite orbit determinations. If receivers at stations receive the own station-disseminated signals via a satellite transponder, it forms an orbit determination mode called “receiving the own station-disseminated signals mode”. If receivers at all stations receive the signals disseminated from the master station via satellite transponders, it forms an orbit determination mode called “receiving the master station-disseminated signals mode”. If all of receivers at stations receive all stations-disseminated signals via satellite transponders, it forms an orbit determination mode called “receiving all stations-disseminated signals mode”. Also there are other combinations of signals for satellite orbit determination. For different orbit determination modes with different signal combinations, their rigorous formulae of processing are hereby presented in this paper. The accurate and the precise satellite orbit determination for both of the modes, “receiving the own station-disseminated signals mode” and “receiving the master station-disseminated signals mode” is attempted. It shows that the accuracy and precision for both of modes are nearly the same, the ranging accuracy is better than 1 cm, and the observation residuals of satellite orbit determination are better than 9 cm in the observation duration of 1 day. Supported by the National Basic Research and Development Program of China (Grant No. 2007CB815503100453001)     

Analysis of an ultrasonic receiving array with strip-type piezotransducers.

A receiving array has been developed and investigated which consists of an ultrasonic scanner with composite strip-type piezoceramic elements, which serve simultaneously both as electroacoustic transducers and also as delay lines in a system for processing received signals operating in the megacycle frequency range. The frequency and pulse responses are considered. Properties of the directional pulse patterns are examined in the case of additive and multiplicative processing of the signals. This receiving array may be used for ultrasonic medical diagnostic devices and for non-destructive testing.     

面向水下应用的电容式微机械超声换能器*

电容式微机械超声换能器具有宽频带和易于制造二维阵列等优势,已经成为一种重要的新型超声换能器。该文针对图像声呐系统对新型超声换能器的迫切需求,提出了一种电容式微机械超声换能器结构和参数,并利用硅微加工技术制备出了该换能器,最后对其主要性能参数进行了测试和分析。测试结果表明该换能器具有发射和接收超声波的功能,中心工作频率为1.965 MHz,6 dB相对带宽达到109.4%,在1 MHz、2 MHz和3 MHz频率时的接收灵敏度分别为-218.29 d B、-219.39 dB和-218.11 dB。该文研制的电容式微机械超声换能器显示出了优秀的宽频带特性,且工作频率和接收灵敏度性能均基本满足了高频图像声呐系统的需求。     

基于多径分集的啁啾扩频正交频分复用水声通信系统

针对传统正交频分复用系统在具有复杂多途和深度频率选择性衰落特点的水声信道中性能下降的问题,提出了啁啾扩频正交频分复用水声通信方案.该方案对原信息码扩频,子载波变为相同调频斜率、不同中心频率、频带相互重叠的正交啁啾信号.经过水声相干多途信道后在接收端解扩,使多个途径信号在频域上拓展,多径信号彼此分离.结合虚拟时间反转镜技术,聚焦多途信道能量,完成信道多径分集接收,不仅可以抑制频率选择性衰落的影响,还充分利用信道多径分集增益提高系统性能.通过仿真研究和湖试验证,表明该方案具有较好的有效性和可靠性.     

Control packet signaling mechanism using electronic code division multiple access for packet-based networks

We propose and experimentally demonstrate the feasibility of a control packet signaling technique using electronic code division multiple access for a wavelength division multiplexing packet-based network, whereby each wavelength channel is assigned a unique electronic code based label on a radio frequency subcarrier. Such a technique allows each wavelength channel to be electronically identified without requiring the use of a WDM demultiplexer. We experimentally demonstrate this technique with two wavelength channels each with 1.25 Gb/s baseband payload data and 10 Mb/s header coded onto an electronic code at 160 Mb/s. A performance study of the electronic code division multiple access based control signaling scheme in a wavelength division multiplexed packet-based access network is also performed in terms of the required power budget to monitor the electronic code division multiple access control signals in the presence of several sources of noise for error-free transmission of both payload data and electronic code division multiple access based control signals. It is shown that the modulation depth of each signal impacts the amount of required optical tap power. As the modulation depth of the electronic code division multiple access based control signal is increased, the required optical tap power is reduced. However, this increases the bit-error-rate for the payload data. Therefore, there lies a maximum and a minimum of the required tap optical power for the successful recovery of both signals. The lower bound of this range is usually determined by the successful recovery of electronic code division multiple access based control signal while the upper bound is determined by the successful recovery of payload data. The required optical tap power is analyzed for different transmission bit rates of the payload data for various receiver architecture scenarios without an optical amplifier at the receiver. The scalability analyses were repeated with an optical amplifier placed in the receiver terminal of the network. The resulting optical tap power that is required for the successful monitoring of the electronic code division multiple access based control signals are compared with that of the case without the amplifier.     

一种通用的卫星导航信号码时延估计误差评估方法

卫星导航信号的码时延估计误差是决定系统服务性能的关键因素,迫切需要对多种不同调制与复用方式的导航信号进行全面的码时延估计误差性能评估,从而为后期的系统应用提供重要的选择依据.为此,本文提出了通用的码时延估计误差评估方法.首先,概括了导航接收机的码跟踪环路模型,根据是否匹配接收以及是否相干处理,将目前的导航接收机归纳为四种类型.其次,在假设码时延估计误差非常小的条件下,分别给出了匹配接收下相干处理和非相干处理时的估计误差以及相互之间的关系;推导了非匹配接收下非相干处理时的估计误差,并讨论了与相干处理时的关系.最后,推导了码时延估计误差的齐夫-扎凯界限,解决了估计误差不满足非常小这一假设条件时的评估.本文提出的评估方法均以导航信号的功率谱密度表示,为信号设计和接收机的研制提供了重要的理论指导,同时也给具体信号的评估带来了极大便利.仿真实验中对新一代典型导航信号的码时延估计误差做了有效评估.     

碱基序列对DNA分子电子结构的影响

将DNA分子看成一维二元随机序列，利用负本征值理论计算其态密度，针对碱基对分布和相对含量等参量，讨论了DNA分子的电子结构.结果表明碱基对分布和相对含量都对电子能态结构影响较大，说明碱基序列对DNA分子的电子结构影响很大. 关键词： DNA分子 电子态密度 碱基对     

Nonlocal Andreev reflection and spin current in a three-terminal Aharonov--Bohm interferometer

This paper theoretically reports the nonlocal Andreev reflection and spin current in a normal metal-ferromagnetic metal-superconducting Aharonov--Bohm interferometer. It is found that the electronic current and spin current are sensitive to systematic parameters, such as the gate voltage of quantum dots and the external magnetic flux. The electronic current in the normal metal lead results from two competing processes: quasiparticle transmission and nonlocal Andreev reflection. The appearance of zero spin-up electronic current (or spin-down electronic current) signals the existence of nonlocal Andreev reflection, and the presence of zero electronic current results in the appearance of pure spin current.