Low-loss, compact waveguiding with TE mode in metal/dielectric waveguides for planar lightwave circuit

We propose a low-loss metal/dielectric waveguide for compact planar lightwave circuit. The basic waveguide structure is a metal-defined high-index-contrast strip waveguide based on silicon/silica. As the guide is designed for TE single mode waveguiding, extremely low propagation loss (e.g. <0.04 dB/cm), very low bend loss (e.g. 0.0043 dB/90°-turn) and small waveguide pitch of zero-crosstalk are theoretically achievable, and can be further improved by compromising with component size and density. Examples of multi-bends and device integration are demonstrated with numerical simulations. The proposal is compatible with silicon technology and appealing for development of silicon-based planar lightwave circuit.     

Incoherently coupled Hermite-Gaussian breather and soliton pairs in strongly nonlocal nonlinear media

We theoretically investigate the propagation of incoherently coupled Hermite-Gaussian breather and soliton pairs in strongly nonlocal nonlinear media. It is found that multipole-mode soliton pairs with arbitrary different orders of Hermite-Gaussian shape can exist when the total power of two beams equals the critical power and the ratio of the beam widths for the Gaussian part is inversely proportional to the square root of the ratio of the wave numbers. When the total power does not equal the critical power, the Hermite-Gaussian breather pair exists and their beam widths evolve analogously. For general cases where the ratio of the beam widths is arbitrary, soliton-breather pairs or breather-breather pairs can be formed and their beam widths evolve synchronously in-phase or out-of-phase. Numerical simulations directly based on the nonlocal nonlinear Schrödinger equation are conducted for comparison with our theoretical predictions. The numerical stability analysis shows the higher-order Hermite-Gaussian solitons can not be stable for small nonlocality or for some media like liquid crystals.     

In situ functionalized self-assembled monolayer surfaces for selective chemical vapor deposition of copper

Recent studies show that the self-assembled monolayer (SAM) is well suited to control the selectivity of chemical vapor deposition (CVD). Here, we reported the selective CVD for copper on the functionalized SAM surfaces (with -SH, -SS-, and -SO₃H terminal groups). The -SS- and -SO₃H terminal group surfaces were obtained through in situ chemical transformation of -SH terminal group surface of a 3-mercaptopropyltrimethoxysilane-SAM (MPTMS-SAM). As a result, the -SS- terminal group surface reduces copper deposition and the -SO₃H terminal group surface enhances copper deposition comparing to the -SH terminal group surface. In addition, the MPTMS-SAM was irradiated by UV-light through a photo mask to prepare SH-group and OH-group regions. Then, copper films were deposited only on the SH-group region of the substrate in chemical vapor deposition. Finally, patterns of copper films were formed in the way of UV-light irradiation. These results are expected for use of selective deposition of copper metallization patterns in IC manufacturing processes.     

Synchrotron radiation assistant MOCVD deposition of ZnO films on Si substrate

The growth of ZnO film on Si(1 0 0) substrate has been studied with synchrotron radiation (SR) assisted MOCVD method. The diethylzinc (DEZn) and CO₂ are used as source materials, while Nitrogen is employed as a carrier gas for DEZn. With the assistance of SR the ZnO film can be deposited even at room temperature. XRD, SEM and photoluminescence (PL) studies show that the crystal quality of ZnO films grown with the assistance of SR is higher than that of those without SR assistance. The growth mechanism of ZnO film with the SR assistant MOCVD system is primarily discussed.     

LaB6场发射阵列牺牲层制备工艺

 分析了传统牺牲层材料铝在制备LaB6场发射阵列时存在的问题,利用溅射及热蒸发工艺依次制备铝膜和氧化锌膜,制备出了一种新型的牺牲层——ZnO-Al复合牺牲层,并对所制备的阵列进行了测试。实验结果表明：ZnO-Al复合牺牲层能够有效地解决电化学腐蚀的问题,所制备出的LaB₆场发射阵列尖锥保持了完好的形貌,其发射特性也达到了最初制备场发射阵列的要求,说明ZnO-Al复合牺牲层是作为LaB₆场发射阵列牺牲层的理想材料。     

高效液相色谱法同时测定心可舒胶囊中齐墩果酸和熊果酸

建立高效液相色谱法同时测定心可舒胶囊中齐墩果酸和熊果酸的含量。采用HypersiL ODSC₁₈（4.6mm×250mm,5μm）色谱柱;流动相:甲醇-乙腈-水=79:5:16（V/V/V）;柱温:30℃;流速:1mL/min;检测波长:210nm。齐墩果酸在2.04—81.60μg/mL浓度范围内线性关系良好（r=0.9998）,熊果酸在5.00—80.00μg/mL浓度范围内线性关系良好（r=0.9998）,齐墩果酸的平均回收率为100.54%,RSD为1.56%,熊果酸的平均回收率为101.10%,RSD为1.13%。该法简单、准确、快捷,可用于心可舒胶囊中齐墩果酸和熊果酸的含量测定。     

富钙镁离子溶液以碳酸盐沉淀固定CO2的试验研究

提出了利用富钙镁离子溶液（海水淡化产生的浓海水、地下卤水、高硬度工业废水等）以碳酸盐沉淀形式实现CO₂固定的思路,以2倍浓度的海水为例进行分析,表明富钙镁离子溶液具有可观的固碳潜力。考察了氨水-氯化铵溶液、氨水-碳酸氢铵溶液和有机胺（MEA、MDEA）作为添加剂提高溶液pH值的方式对碳酸盐沉淀形成能力的影响。结果表明这三种添加剂均可在一定程度上提高溶液pH值,促进富钙镁离子溶液中难溶碳酸盐沉淀形成。     

基于非结构网格间断有限元方法在可压缩流体中的应用

本文开发了一套基于非结构网格的间断有限元方法(DG)程序,并对与单元形状无关的斜率限制器进行了研究。此程序支持多种网格类型,能够方便应用于具有混合单元的非结构网格,具有处理复杂几何结构的能力,为研究叶轮机械内部复杂流动现象提供了有效的研究工具。本文利用该程序对若干典型无黏和黏性问题进行数值模拟,结果表明,该程序具有较高的可信度,能够处理具有混合单元的非结构网格,并给出良好的数值模拟结果。     

利用非线性传输线产生高功率射频场

根据孤立子理论,分析了利用变容非线性传输线产生射频场的机理。利用电路仿真方法系统地研究了影响射频场产生的相关参数,发现电感和零压电容越小、输入电压越大,射频场的频率越高;电容的非线性率越大,射频场的峰值电压越高、高频成分越多。并在此基础上,仿真设计了能产生峰值功率为0.8 GW、主频为19.42 MHz射频场的非线性传输线。     

Quantum information splitting of an arbitrary three-qubit state via the cavity input–output process

We propose a realizable quantum information splitting (QIS) scheme for an arbitrary three-qubit state via the cavity input–output process. In our scheme, a four-qubit cluster state and a three-qubit Greenberger–Horne–Zeilinge (GHZ) state are used as quantum channel. The sender and controller only need to perform Bell-state measurements and a single-qubit measurement, respectively. The receiver can reconstruct the arbitrary three-qubit state by classical communication and local operations. Compared with the scheme in Nie et al. [Optics Communications 284 (2011) 1457], the quantum resources and classical information in our scheme are decreased by 5 qubits and 1 bit, respectively. Moreover, we replace the W-state category measurement in the former with Bell-state measurements and a single-qubit measurement, which is more simple and feasible in experiment.