Fluorescence Enhancement of a Polymer Planar Waveguide Doped with Rhodamine B and Ag Nanoparticles

与 Ag nano 粒子和玫瑰精 B 做的平面聚合物多模型波导被光谱学分析方法以及他们线方法制作并且调查。显示出的试验性的结果当激动时，那荧光改进在某个水平与 Ag nano 粒子集中由宽乐队波长发生。当激动时，在我们的实验的最大的改进因素被 350nm 获得是大约 3.8。我们的学习可以在聚合物有潜在的应用光元素，例如聚合物波导激光和放大器。

Single-to-Multiple Channel Wavelength Conversions and Tuning of Picosecond Pulses in Quasi-Phase-Matched Waveguides

We report the single-to-multiple channel wavelength conversions of 1.57-ps pulses based on cascaded secondharmonic generation and difference frequency generation in quasi-phase-matched periodically poled lithium hiebate waveguides. For single-to-single channel wavelength conversion, no external cavity laser is required with use of a fibre ring laser. The conversion efficiency is about -21.44 dB. The converted idler wavelength can be tuned from 1526.4nm to 1537.5nm as the lasing pump wavelength is varied from 1566.1 nm to 1555.0nm. By employing several input pumps, tunable single-to-dual and single-to-triple channel wavelength conversions are experimentally demonstrated.

Research of Plasma Characteristics of the Radio-Frequency Discharge in O2 and Its Mixtures

Electron mean energy and the effects of gas mixture are studied theoretically and experimentally. The electron mean energy in O2 and its mixtures is obtained by solving Boltzmann＇s equation. The experiments of the Langmuir probe system and spectral analysis are carried out. It is shown that electron temperature goes down with the increasing pressure, narrowing pulse width and the addition of helium and argon. According to the intensity of oxygen atom at 777.19 nm, xenon is more effective in inhibition of O2 decomposition than helium and argon.

A Microwave Photonic Notch Filter Using a Microfiber Ring Resonator

一个新奇悦耳的微波 photonic 过滤器基于一个 microfiber 戒指共鸣器被建议并且试验性地示威了。纤维戒指激光基于 microfiber 戒指共鸣器被采用产生二个 single-longitudinal-mode 搬运人，然后，散元素介绍在二个调制搬运人之间的延期。由调整 microfiber 戒指共鸣器的直径，建议微波 photonic 槽口过滤器能连续地并且广泛地被调节。测量槽口拒绝比率比 35 dB 大，并且在试验性的结果和理论分析之间有好同意。[从作者抽象]

Propagation of Ultra-fast Femtosecond Pulses in Silicon-on-insulator Optical Waveguides

A complete theoretical modeling, avoiding any priori-assumption, is deduced and demonstrated for ultra-fast femtosecond optical pulses in silicon-on-insulator optical waveguides which includes the group velocity dispersion, third-order dispersion, self-phase and cross-phase modulations, self-steepening and shock formation, Raman depletion, propagation loss, two-photon absorption, free-carrier absorption, and free-carrier dispersion. Finally, the temporal and spectral characteristics of 100 fs optical pulses at 1.55 μm are numerically observed in 5-mm-long waveguides while considering different initial chirps and incident peak intensity levels.

Visibility in differential phase-contrast imaging with partial coherence source

This paper gives theoretical analysis of visibility of fringes, which is influenced by distances, temporal and spatial coherence of source, in hard x-ray differential phase-contrast imaging with microfocus x-ray source. According to the character of longitudinal periodicity of the interferogram, the setup is insensitive to mechanical drift and vibrations. The effect of temporal coherence of x-ray source is investigated and its related bandwidth is derived. Based on the theory of partially coherent light, it shows that the requirement for the spatial coherence of x-ray source is not strict and can be met by the general microfocus x-ray tube for x-ray differential phase-contrast imaging.

High-Sensitivity Sensor Based on Surface Plasmon Resonance Enhanced Lateral Optical Beam Displacements

We present a new optical sensor based on surface plasmon resonance （SPIt） enhanced lateral optical beam displacements. Compared with the traditional SPIt methods, the new method provides higher sensitivity to the sensor system. Theoretical simulations show that the refractive index （RI） detection sensitivity of the SPR sensor based on the displacement measurement has a strong dependence on the thickness of the metal film. When the optimal thickness of the metal film is selected, the RI resolutlon of the SPIt sensor is predicted to be 2.2 × 10^-7 refractive index units （RIU）. Furthermore, it is found that the incidence angle can be used as a parameter to adjust the operating range of the sensor to different refractive index ranges.

A Flexible Improvement for Ping-Pong Protocol

A deterministic quantum communication protocol, called the ping-pong protocol, has been represented by Bostr6m and Felbinger [Phys. Rev. Lett. 89 （2002） 187902]. Based on an entangled pair of photons, it allows asymptotically secure key distribution and quasi-secure direct communication. However, it was concluded from our previous research that the experiment realization of this protocol requires two optic paths strictly equivalent for interferometry. Here we propose an improved protocol, which is more flexible and secure for conceivable applications. Its feasibility and security are also discussed.

Metal cathode patterning for OLED by nanosecond pulsed laser ablation

In this paper,nanosecond pulsed laser is introduced to selectively ablate away indium tin oxide film and metal film without destroying the underlying layers for fabricating organic light-emitting diodes.By varying density of energy,pulse number and width of the laser,the influence on morphology of the laser trenches of indium tin oxide and metal films are investigated.It is presented that uniform ablation trench can be obtained with 16 laser pulses at 0.15 J/cm^2 for aluminum film and 10 laser pulses at 0.65 J/cm^2 for indium tin oxide film.It is found that the characteristics of the organic light-emitting diodes prepared with laser ablation are almost the same as those of that prepared with conventional patterning method.

Area Analysis for On-chip Routers with Different Data-link Widths

Compared with the traditional and inter-chip networks, on-chip networks （NoCs） have enormous wire resources which can be traded for improving other performance requirements. This means that much wider data links can be used for NoCs. This paper focuses on the area costs for on-chip routers under four different data-link widths： 8 bits, 16 bits, 128 bits, and 256bits. Firstly, a virtual-channel based on-chip router is introduced. Secondly, the components of the router are implemented by Verilog HDL models and synthesized by Quartus II 4.0 in a FPGA device. Finally, the area costs are analyzed. It can be seen from the results that data-link width has great influence on area costs of buffers and crossbar while has no influence on area costs of arbiter.

Temperature effects of dark solitons on the self-deflection of bright solitons in a separate bright-dark soliton pair

Based on the theory of one-dimensional separate soliton pairs formed in a serial photorefractive crystal circuit, we investigated the temperature effects of the dark soliton on the self-deflection of the bright soliton in a bright-dark soliton pair. The numerical results obtained by solving the nonlinear propaga-tion equation showed that the bright soliton moves on a parabolic trajectory in the crystal and its spa-tial shift changed with the temperature of the dark soliton. The higher the temperature of the dark soli-ton was, the smaller the spatial shift of the bright soliton was. The self-bending process was further studied by the perturbation technique, and the results were found to be in good agreement with that obtained by the numerical method.

Kinetic modeling of a high power fast-axial-flow CO_2 laser with computational fluid dynamics method

A new computational fluid dynamics （CFD） method for the simulation of fast-axial-flow CO2 laser is developed. The model which is solved by CFD software uses a set of dynamic differential equations to describe the dynamic process in one discharge tube. The velocity, temperature, pressure and turbulence energy distributions in discharge passage are presented. There is a good agreement between the theoretical prediction and the experimental results. This result indicates that the parameters of the laser have significant effect on the flow distribution in the discharge passage. It is helpful to optimize the output of high power CO2 laser by mastering its kinetic characteristics.

Generation of modified duobinary return-to-zero format using polarization-maintaining fiber loop mirror

Modified duobinary return-to-zero （MD-RZ） format is an improvement of optical duobinary （ODB） format.This paper proposes a novel, all-optical method to generate-MD-RZ format by using a polarization main-talning fiber loop mirror （PMFLM）. Operation principle for all-optical format conversion is theoretically analyzed and the output spectrum is simulated. 40-Gb/s MD-RZ data format generation is experimentally demonstrated.

Photoelectrochemical etching of uniform macropore array on full 5-inch silicon wafers

We analyze the two main factors causing non-uniformity of the etched macropore array first,and then a novel photoelectrochemical etching setup for large area silicon wafers is described.This etching setup refined typical etching setups by a water cooling system and a shower-head shaped electrolyte circulator.Experimental results showed that the uniform macropore array on full 5-inch n-type silicon wafers could be fabricated by this etching setup.The morphology of the macropore array can be controlled by adjusting the corresponding etching parameters.