bluuebunny/crossref_metadata_2025 huggingface dataset:
Research of tricolor microcavity top-emitting organic light-emitting devices with white emitting layer
Authors: Cao Jin  , Jiang Xue-Yin  , Zhang Zhi-Lin  ,   上海大学新型显示技术与应用集成教育部重点实验室，上海大学材料学院，上海 200072
Published: December 2020

RGB pixel generation by microcavity top-emitting organic light-emitting diodes (TOLEDs) is beneficial to both the reduction of the light loss and the improving the color purity and efficiency. Based on the multi-emitting layers, white organic light-emitting diodes (OLEDs) and microcavity TOLEDs were prepared. TOLEDs were made using Ag/ITO as the reflector and adjusting layer, Al/Ag as the semi-transparent cathode, and Alq：DCJTB/TBADN：TBPe/Alq：C545 as white light emitting layer. By adjusting the thickness of ITO, optical length of cavity the colour of the device can be changed, so the RGB tricolor devices are obtained. The peak wavelengths are 476，539 and 601nm, the commission Internationale d'Eclairage (CIE) coordinates are (0.133，0.201)，(0.335，0.567) and (0.513，0.360), and the FWHM are 32，50 and 73nm for Blue, Green and Red，respectively.
Energy transfer in organic quantum well structures
Authors: Song Shu-Fang  , Zhao De-Wei  , Xu Zheng  , Xu Xu-Rong  ,   北京交通大学光电子技术研究所，发光与光信息技术教育部重点实验室，北京 100044
Published: December 2020

Different types of organic quantum well structures have been grown by organic molecular beam deposition. Energy level and optical property of the quantum well are determined by cyclic voltammetry, optical absorption and photoluminescence. Cyclic voltammetry and optical absorption results indicate that PBD/ Alq3 multilayer can be classified as type Ⅰ, NPB/Alq3 and BCP/ Alq3 as type Ⅱ. The PL experimental results indicate that the structures of PBD/ Alq3 and BCP/ Alq3 exhibit complete energy transfer from PBD or BCP to Alq3, and the structures of NPB/Alq3 exhibit partial energy transfer from NPB to Alq3. The reason for energy transfer in organic quantum well structures is discussed in light of the theoretical and experimental results published in the literature.
Two-dimensional magnetophotonic crystals and analysis of the mode field
Authors: Zhang Hao  , Zhao Jian-Lin  , Zhang Xiao-Juan  , Di Nan  ,   西北工业大学理学院光信息科学与技术研究所，陕西省光信息技术重点实验室,西安 710072
Published: December 2020

The mode field and effective index of two structures (square air core and circular air core) of two-dimensional magnetophotonic crystals is analyzed using finite-difference frequency-domain (FDFD) method. According to the result of numerical analysis, the two degenerate fundamental modes become non-degenerate (L-mode and R-mode) in the structures, and the two corresponding effective indices are different. The Faraday rotation of these two structures is enhanced compared with that of the continuous magneto-optical materials. By choosing proper parameters of the air core, the Faraday rotation can be increased by one order for the square air core structure and 4 times for the circular core structure. The polarization state of optical waves is changed after passing through the structure. With the increasing of Faraday rotation, the ellipticity of outgoing optical waves is increased. Finally, we discuss the cause of the phenomena and present a method to resolve the problem of variation of ellipticity by introducing defect in the structure.
Growth rate model of InP epitaxial lateral overgrowth
Authors: Liu Lei  , Ren Xiao-Min  , Zhou Jing  , Wang Qi  , Xiong De-Ping  , Huang Hui  , Huang Yong-Qing  ,   (1)北京邮电大学光通信与光波技术教育部重点实验室，北京 100876; (2)北京邮电大学继续教育学院，北京 100876
Published: December 2020

Theoretical expressions of the epitaxial lateral overgrowth rate in the metalorganic chemical vapor deposition (MOCVD) have been formulated in this paper, with respect to two separate processes: vapor phase diffusion and mask surface diffusion. In the case of InP deposition on GaAs substrate, a parametric study was accomplished in order to determine the impact of the mask/window width to the growth rate. The model, which uses a new parameter “effective mask length” Lmask, reveals that the key factors determining the growth rate are mask/window width and mask width/effective mask length. This model can be used as a tool for predict the growth conditions leading to expected growth rate.
Optical properties of ZnO and MgxZn1－xO nanoparticles prepared by flame spray synthesis
Authors: Li Hui  , Xie Er-Qing  , Zhang Hong-Liang  , Pan Xiao-Jun  , Zhang Yong-Zhe  ,   兰州大学物理科学与技术学院，兰州 730000
Published: December 2020

Zinc oxide (ZnO) and magnesium doped ZnO (MgxZn1-xO) nanoparticles were prepared by flame spray synthesis. X-ray diffraction and field emission scanning electron microscopy were used to investigate the composition and structure of the samples. The results indicated that the samples contained nanoparticles of uniform size ranging between 10—20nm; and after introducing Mg into ZnO the lattice constant decreased. According to the UV-VIS transmission spectra, the band gap of MgxZn1-xO nanoparticles was wider than that of ZnO nanoparticles. The photoluminescence of the samples showed high intensity UV emission, and the mechanisms of emission were discussed.
Laser pulse control of ultrafast heterogeneous electron transfer——The multiple vibrational mode three electronic state system
Authors: Li Hong  , Zhang Yong-Qiang  , Cheng Jie  , Wang Lu-Xia  , Liu De-Sheng  ,   (1)山东济宁学院物理系，曲阜 273100; (2)山东济宁学院物理系，曲阜 273100;北京科技大学物理系,北京 100083; (3)山东济宁学院物理系，曲阜 273100;山东大学物理与微电子学院，济南 250100; (4)山东济宁学院物理系，曲阜 273100;山东大学物理与微电子学院，济南 250100;山东大学晶体材料国家重点实验室,济南 250100
Published: December 2020

With the combination of the optimal control theory and MCTDH method, optimal controlling of multi-dimensional multi-state molecule such as pyrazine is realized. The quantum dynamics of this molecule under the excitation of optimal pulse is simulated. On the basis of the simulation of two-state multi-dimensional system, we consider the two excited states as target states, and the effect of target state on the quantum dynamics is discussed.
Studies on the laser-induced damage resistance of sol-gel derived ZrO2-TiO2 composite high refractive index films
Authors: Liang Li-Ping  , Zhang Lei  , Sheng Yong-Gang  , Xu Yao  , Wu Dong  , Sun Yu-Han  , Jiang Xiao-Dong  , Wei Xiao-Feng  ,   (1)中国工程物理研究院激光聚变研究中心，绵阳 621900; (2)中国科学院山西煤炭化学研究所煤转化国家重点实验室,太原 030001; (3)中国科学院山西煤炭化学研究所煤转化国家重点实验室,太原 030001;太原科技大学材料科学与工程学院,太原 030024;中国科学院研究生院,北京 100049; (4)中国科学院山西煤炭化学研究所煤转化国家重点实验室,太原 030001;中国科学院研究生院,北京 100049; (5)中国科学院山西煤炭化学研究所煤转化国家重点实验室,太原 030001;中国科学院研究生院,北京 100049;中国工程物理研究院激光聚变研究中心，绵阳 621900
Published: December 2020

ZrO2-TiO2 composite films with mol fraction of Ti in the total amount of Zr and Ti ranging from 0 to 100, have been prepared by the sol-gel spin-coating method. The microstructure, optical properties, and laser-induced damage resistance (LIDR) of these films were investigated, and emphasis was given to the compositional dependence of the laser-induced damage threshold (LIDT). The experimental results indicate that at a small expense of refractive index, the sol-gel process can considerably improve the LIDR of the films. Moreover, with increasing mol fraction of Ti from 0 to 100, a general decrease of the LIDT in a wide range of 57.1—20.9J/cm2(at 1053nm，10ns pulse duration and in “R/1” testing mode) was observed. Combining the structural and optical analysis results, a possible correlation between the LIDR and optical band gap of the prepared films is presented on the basis of the multiphoton absorption model.
Adaptive wavelet algorithm for complicated spectra data compression
Authors: Wang Kai  , Zhang Hui  , Chang Sheng-Jiang  , Shen Jin-Yuan  ,   (1)南开大学现代光学研究所，光电信息科学教育部重点实验室，天津 300071; (2)郑州大学信息工程学院，郑州 450052
Published: December 2020

An adaptive wavelet analysis approach based on recursive least square (RLS) algorithm is proposed for analyzing the complicated spectra emitted by the interaction between femto-second laser and gases. The simulation results on twenty-seven sets of spectral data show that the proposed method has high efficiency in data compression. The data of the original spectra with 3968 points can be compressed to 124 points, and the correct recognition rate of support vector machine (SVM) can be as high as 100%, when thirteen or more compressed spectra are used for training and the others for testing.
Chebyshev generalized finite spectral method for linear and nonlinear waves
Authors: Zhan Jie-Min  , Lin Dong  , Li Yok-Sheng  ,   (1)香港理工大学土木及结构工程系，香港九龙; (2)中山大学应用力学与工程系，广州 510275; (3)中山大学应用力学与工程系，广州 510275;中山大学近岸海洋工程广东省重点实验室，广州 510275
Published: December 2020

A Chebyshev generalized finite spectral method is proposed for 2-D linear and nonlinear waves. To attain high accuracy in time discretization, the fourth-order Adams-Bashforth-Moulton predictor and corrector scheme was used. The proposed numerical scheme is validated by applications to the linear shallow water equations and extended Boussinesq equations, where analytical solution and experimental data are available for comparison respectively. Numerical results agree very well with the corresponding analytical solution or experimental data in all cases.
Robust quantum computation of the kicked Harper model and quantum chaos
Authors: Ye Bin  , Gu Rui-Jun  , Xu Wen-Bo  ,   江南大学信息工程学院，无锡 214122
Published: December 2020

The stability of quantum computating of the kicked Harper model with various perturbations is investigated. Above a certain threshold of the imperfections, quantum chaos sets in. The effects of the noise errors and the static imperfections on the quantum computation are analyzed by comparing the statistical ergodic properties and the Husimi functions of the perturbed eigenstates with the ideal eigenstates of the Floquet operator. It is shown that the fidelity decay with static imperfections is exponential while it is Gaussian with noise errors. The time scales of reliable computation with these perturbations are obtained through numerical simulations. Due to the errors in classical computation the distance of two initial states increases exponentially, while the stability of quantum computation is independent of the integrable or chaotic nature of the underlying dynamics.
Canonical entropy of black hole
Authors: Zhao Ren  , Zhang Li-Chun  , Zhang Sheng-Li  ,   (1)山西大同大学物理系，大同 037009; (2)山西大同大学物理系，大同 037009;西安交通大学理学院应用物理系,西安 710049; (3)西安交通大学理学院应用物理系,西安 710049
Published: December 2020

Recently, Hawking radiation of the black hole was studied by tunnel effect method. It was found that the radiation spectrum of the black hole is not a strictly pure thermal spectrum. How the deviation between the radiation spectrum from pure thermal spectrum affect the entropy is a very interesting problem. In this paper, we calculate the partition function using the energy spectrum derived by tunnel effect, then obtain the entropy of the black hole. When we take first order approximation, the logarithmic term of entropy correction is consistent with the one considering the generalized uncertainty relation. However, in our calculation, there is no uncertain factor. And the coefficient of logarithmic correction term is the same one after considering the correction to the black hole entropy due to the thermal fluctuation. There are no divergent terms in our result when the thermal capacity of the black hole is negative. So our discussion has universality.
The intermittency and extended dimension induced by truncation error
Authors: Sheng Li-Yuan  , Jia Wei-Yao  , Wu Shu-Ci  , Xia Guo-Rong  ,   (1)西南大学物理科学与技术学院,重庆 400715; (2)中南林业科技大学电子与信息工程学院,长沙 410004; (3)中南林业科技大学电子与信息工程学院,长沙 410004;中南大学物理科学与技术学院,长沙 410083
Published: December 2020

We further studied the cross-focus system and found direct experimental evidence for the truncation error induced intermittency. The experiment demonstrated that, the numerical solution of the cross-focus system shows features of on-off intermittency, while the analytical solution of the cross-focus system is only a simple limited sequence, and the shadowability controls the system evolution. The accumulation of truncation errors imply the shadowing distances of evolving orbits, and the shadowing distance increases on approaching the fixed point and decreases on leaving the fixed point, and the increment equals the decrement in the cycles statistically. In the vicinity of nonhyperbolic fixed point, there is a threshold value, when the accumulation surpasses this threshold value, a tailure of the shadowability takes place, the system jumps from the attraction phase to the repulsion phase. It is reasonably conjectured that a new extended dimension may occur locally in the vicinity of nonhyperbolic fixed point due to truncation errors.
Research on genetic algorithm optimization based on PID control with two degrees of freedom controller for chaotic system
Authors: Niu Pei-Feng  , Zhang Jun  , Guan Xin-Ping  ,   燕山大学电气工程学院，秦皇岛 066004
Published: December 2020

The proportional-integral-derivative (PID) control algorithm with two degrees of freedom are easy and useful. But when they are applied to nonlinear systems, the parameters are difficult to tune. Using improved genetic algorithm to optimize parameters of PID controller with two degrees of freedom, the convergence rate of parameter optimization is rapid and accurate. When applied to Chen's chaotic system and synchronous motor chaotic system, good results are obtained in simulation experiments.
Initial condition estimation from coupled map lattices based on symbolic vector dynamics
Authors: Wang Kai  , Pei Wen-Jiang  , Xia Hai-Shan  , He Zhen-Ya  ,   东南大学无线电工程系,南京 210096
Published: December 2020

In this paper, we consider a symbolic dynamic method, based on going athwart the coupled map lattices, to estimate unknown initial conditions of nonlinear dynamical system from the given symbolic vector sequence. It is proved that any value taken from the interval IN will converge to the initial conditions with the iteration of athwart-coupled map lattices function, and an initial condition detection method from symbolic vector sequence is presented. Both theoretical and experimental results show that the estimation method can establish one-to-one correspondence between the initial conditions of coupled map lattices and their symbolic vector sequence; therefore this technique appears to be ideally suited for information estimation.
Impulsive synchronization for unified chaotic systems with channel time-delay and parameter uncertainty
Authors: Ma Tie-Dong  , Zhang Hua-Guang  , Wang Zhi-Liang  ,   东北大学信息科学与工程学院，沈阳 110004
Published: December 2020

In this paper, an impulsive control for synchronization of a class of unified chaotic systems with channel time-delay and parameter uncertainty is proposed. The practical stability of impulsive synchronization between two nonautonomous chaotic systems is studied. This practical stability is equivalent to that of the synchronization error system at the origin. Based on the theory of impulsive differential equation, the criterion for the practical stability of the synchronization error system at the origin is presented. Numerical simulations show the effectiveness of the method.
Study of nonlinear identification of time series of vibration on transducer in ultrasonic bonding system
Authors: Song Ai-Jun  , Han Lei  ,   中南大学机电工程学院，长沙 410083
Published: December 2020

Using high temperatures and ultrasonic, ultrasonic bonding is one of the main methods in the wire bonding technology of the MEMS. The vibrations of transducer were tested. Based on the phase reconstruction theory, identification of the nonlinear characteristics was developed. In comparison with the time series along the axial direction, pitching direction and the horizontal direction, the correlated dimensions have been calculated, clearly describing the nonlinear dynamic characteristics of the transducer. It is helpful for understanding of transducer and can be used as a guide for modeling of this complicated structure.
Escaping problem in the Hénon-Heiles system and numerical algorithms
Authors: Zhao Hai-Jun  , Du Meng-Li  ,   中国科学院理论物理研究所，北京 100080
Published: December 2020

We study the trajectories and escaping problem in the Hénon-Heiles system using a new fourth order symplectic algorithm and the Runge-Kutta-Fehlberg algorithm. Starting from the same initial point，we found the distance between the two numerical trajectories calculated by the two algorithms increases exponentially in time in the chaotic region. We show this result can be used to measure chaos. We also calculate the escape rate as a function of energy above threshold in the Hénon-Heiles system. The results calculated with two different algorithms agree very well.
Study of multi-fractal spectrum of sol-gel hydrophobic anti-reflective SiO2 coating after laser-conditioning
Authors: Zhang Lei  , Xu Yao  , Jiang Xiao-Dong  , Liang Li-Ping  , Lü Hai-Bin  , Li Xu-Ping  , Wei Xiao-Feng  , Wu Dong  , Sun Yu-Han  ,   (1)中国工程物理研究院激光聚变研究中心，绵阳 621900; (2)中国科学院山西煤炭化学研究所煤转化国家重点实验室，太原 030001; (3)中国科学院山西煤炭化学研究所煤转化国家重点实验室，太原 030001;中国工程物理研究院激光聚变研究中心，绵阳 621900;中国科学院研究生院，北京 100049; (4)中国科学院山西煤炭化学研究所煤转化国家重点实验室，太原 030001;中国科学院研究生院，北京 100049
Published: December 2020

Hydrophobic AR SiO2 coating was deposited on the K9 substrate with sol-gel dipping technique，and laser-conditioning was done in “R on 1" mode with Nd:YAG laser (1064nm，7.5ns). Laser-induced damage thresholds (LIDT) were measured by “1 on 1" mode，and fore-and-aft changes of the surface morphology and fractal structure of the coating caused by laser conditioning were investigated with atomic force microscope (AFM) and multi-fractal spectrum (MFS), respectively. The results showed that after laser-conditioning the LIDT of the coating increased obviously，the mean-square roughness decreaseds lightly and the surface of the coating became more smooth，and that width of MFS shrinked and the uniformity of distribution of fractal framework was improved. It means that the micro-structure of the surface of the coating become, so regular that the coating could resist more powerful laser irradiation. Further more，MFS is an effective method to research mechanism of high power laser irradiation on optical coating because we can acquire more information about the change of the surface structure of the coating.
On dynamics of precipitated grains migrating in molten metal under high gradient magnetic field
Authors: Jin Fang-Wei  , Ren Zhong-Ming  , Ren Wei-Li  , Deng Kang  , Zhong Yun-Bo  ,   上海大学材料科学与工程学院，上海 200072
Published: December 2020

The precipitated grains in molten metal are to migrate due to the magnetization force. A model describing the migration of a single grain in motlen metal has been proposed in terms of the classical dynamics of rigid body, in which the grain is regarded as a sphere. The theoretical expressions about effective viscosity of the conducting melt, the velocity and distance of migrating grains were derived. The effective viscosity increases linearly with the increment of B2 (the square of the magnetic flux density). The migrating velocity is accelerated to the final value in several ms. The final speed decreases sharply with the increment of the magnetic flux density, which demonstrates that the migration of the grain is suppressed by the high magnetic field. The migration distance is closely relative with the distribution of the magnetic flux density. In order to examine the situation of the primary Si, the sample of Al-18wt%Si alloy was held at 650℃ for an hour and then a high gradient magnetic field (Bz=5T，BzdBz/dz=-224T2/m) was imposed for a certain time before quenching the sample from the melt. The experimental results indicated that the grains withradii larger than or equal to 40μm were mostly migrated in 120s，in good agreement with the theoretical calculation.
The tunable diode laser absorption spectroscoty for measurement of NH3 with particles
Authors: Wang Fei  , Huang Qun-Xing  , Li Ning  , Yan Jian-Hua  , Chi Yong  , Cen Ke-Fa  ,   浙江大学能源清洁利用国家重点实验室，杭州 310027
Published: December 2020

Tunable diode laser absorption spectroscopy (TDLAS) with wavelength modulation is used to measure the NH3 concentration at normal temperature and pressure near 1531.7nm in near-infrared region. The concentration of 25ppm can be obtained by 10m long-path cell，and concentration from 25ppm to 400ppm has good linear relationship with 2f signal. The effect of particles on 2f signal is discussed in this paper，and a solution of the problem using laser intensity linear fit to make the concentration measurement immune to particle disturbance is suggested.
Cascade decays and final charge-state distribution of single K-vacancy and double K-vacancy magnesium ions
Authors: Hu Hong-Wei  , Dong Chen-Zhong  , Shi Ying-Long  ,   西北师范大学物理与电子工程学院，兰州 730070
Published: December 2020

Based on the conclusion that the contribution of correlated decay of two vacancies in atoms is small，the de-excitation process of Mg1+(1s-1) hollow magnesium ions with single K-vacancy and Mg2+(1s-2) double K-vacancy were treated by applying the radiative-single Auger - double Auger cascade model（RACDA）. The final-charge-state distribution(FCSD) of these hollow ions were calculated，and compared with that obtained with the radiative-single Auger cascade model（RAC）. The probability of tetravalent ion production via the de-excitation of Mg1+(1s-1) obtained by RACDA model is considerable，but tetravalent ion is not produced in the by RAC model. The probability of hexavalent ion production via the de-excitation of Mg2+(1s-2) obtained by RACDA model is very large，but hexavalent ion is not produced in the RAC model.
Negative quantum conditional entropy and the entanglement measure of a kind of mixed state of bipartite quantum system
Authors: Zhou Bing-Ju  , Liu Xiao-Juan  , Fang Mao-Fa  , Zhou Qing-Ping  , Liu Ming-Wei  ,   (1)湖南科技大学物理学院，湘潭 411201; (2)湖南科技大学物理学院，湘潭 411201;湖南师范大学物理与信息学院，长沙 410081;中国科学院安徽光学精密机械研究所，合肥 230031; (3)湖南师范大学物理与信息学院，长沙 410081;中国科学院安徽光学精密机械研究所，合肥 230031
Published: December 2020

From negative quantum conditional entropy point of view this paper intestigates the entanglement measure of the prue state and a kind of mixed state of bipartite quantum system. Also this paper gives a definition of quantum conditional entropy of entanglement EA｜B(ρAB) and proves that it satisfies the four fundamental conditions of a entanglement measure for a kind of mixed state of 2×2 quantum system by this negative quantum conditional entropy Using conditional entropy of entanglement, this paper investigates the quantum entanglement between the two identical two-level atoms simultaneously interacting with vacuum cavity field as an application. This paper compares conditional entropy of entanglement and concurrence at the same condition, and the result shows that the curves of their evolvements are identical. These obtained results test and verifys that conditions of an entanglement measure may be taken as the entanglement measure of the prue state and a kind of mixed state of bipartite quantum system.
Study on the properties of LD-pumped Nd:LuVO4 microchip laser
Authors: Xu Fang-Hua  , Wang Zheng-Ping  , Zhang Huai-Jin  , Liu Xun-Min  , Xu Xin-Guang  , Wang Ji-Yang  , Shao Zong-Shu  , Jiang Min-Hua  ,   山东大学晶体材料国家重点实验室，济南 250100
Published: December 2020

A new LD end pumped Nd：LuVO4 microchip laser was reported for the first time. Study of laser properties was carried out on the effects of different Nd3+ doped concentration，different cavity length and different 1064nm transmission. The relationship between the maximum output power and LD performance temperature was measured at different pump power. 923mW of continuous output at 1064nm with TEM00 mode was obtained at 2W pump power，the pump threshold being 48mW. The slope efficiency was 52%，and increased to 59% when the microchip was cooled.
Generation of spacial second-harmonic in photorefrective photonic lattice
Authors: Yang Li-Sen  , Chen Yu-He  , Lu Gai-Ling  , Liu Si-Min  ,   (1)内蒙古师范大学物理与电子信息学院,  呼和浩特 010022; (2)南开大学物理学院,天津 300071
Published: December 2020

Using interference method fabricate photonic lattices in self-defocus photorefractive crystal LNbO3:Fe. We had find the phenomenons that dual-beam interference fringe one divides into two,four-beam interference fringe one divides into four. We had proved it is a kind of phenomena of spacial frequency-doubling, this kind of phenomenon is the result of the interaction between the interfere field and the interfere field fabricative photonic lattices. This experiment had showed that spacial second-harmonic generation and high-order harmonics generation can be easy achieved by photorefractive effect crystal,that second-harmonic can fabricate spacial frequency-doubling photonic lattices, that high-order harmonics can fabricate spacial frequency-high photonic lattices.
Analysis of the back-gate effect on the breakdown behavior of lateral high-voltage SOI transistors
Authors: Qiao Ming  , Zhang Bo  , Li Zhao-Ji  , Fang Jian  , Zhou Xian-Da  ,   电子科技大学微电子与固体电子学院,成都 610054
Published: December 2020

A novel back-gate reduced bulk field concept which makes a breakthrough in improving the vertical breakdown voltage of high voltage SOI transistors is proposed. The mechanism of the improved breakdown characteristics is that the electric field distributions of the active region are modulated by the interface charges induced by the back-gate voltage. The bulk electric field at the drain side is reduced, the bulk electric field at the source side is increased, and the breakdown voltage of the high voltage SOI device is improved. The impact of the back-gate bias on thick film SOI LDMOS (over 600 V) is discussed via two-dimensional simulations. When the back-gate bias is 330V, the breakdown voltage of the three-zone SOI double RESURF LDMOS is 1020V, which is 47.83% greater than that of a conventional LDMOS. The novel concept presents a new method for realizing over 600 V high voltage power device and high voltage integrated circuit.
Linear and nonlinear optical properties of Ag:Bi2O3 composite films
Authors: Zhu Bao-Hua  , Wang Fang-Fang  , Zhang Kun  , Ma Guo-Hong  , Guo Li-Jun  , Qian Shi-Xiong  ,   (1)复旦大学物理系，上海 200433; (2)河南大学光学与光电子技术研究所，物理与信息光电子学院，开封 475001; (3)上海大学理学院，上海 200444
Published: December 2020

On the basis of measurements and theoretical analysis, linear and nonlinear optical properties on the Ag:Bi2O3 composite films with different Ag concentrations were investigated. The relationship between the Ag concentrations and the surface plasmon resonance (SPR) of Ag:Bi2O3 composite films were characterized by UV-VIS-NIR spectroscopy, and the dependence of third-order nonlinear susceptibility of composite films on Ag concentrations was investigated by picosecond Z-scan technique with different excitation wavelength (532nm and 1064nm). The analysis of optical properties of these films was carried out using the theories of surface plasmon resonance and localized field enhancement respectively. From the experimental and theoretical results, the dependence of third-order nonlinear susceptibilities χ(3) on Ag concentration was shown. With Ag concentration around 35％ and the excitation wavelength at 532nm near the surface plasmon resonance (560nm—622nm), the third-order nonlinear susceptibility χ(3) showed a maximum value of 2.4×10-9 esu.
Thermodynamic analysis of the hydrogen storage of LaNi5
Authors: Zhang Xiu-Lan  , Huang Zheng  , Chen Bo  , Ma Huan-Feng  , Gao Guo-Qiang  ,   (1)西南交通大学理学院，成都 610031; (2)中国工程物理研究院核物理与化学研究所，绵阳 621900
Published: December 2020

The thermodynamic equilibrium relationship of the hydrogen storage of LaNi5 is analyzed. An equilibrium formula describing the P-C-T relationship for covering all the available experimental data is derived. The experimental P-C-T relationship is analyzed using the equilibrium formula. The thermodynamic functions for the equilibrium of the hydrogen storage are calculated and discussed.
Atomic mechanism of twin formation in CVD diamond films
Authors: Zhu Hong-Xi  , Mao Wei-Min  , Feng Hui-Ping  , Lü Fan-Xiu  , Vlasov I. I.  , Ralchenko V. G.  , Khomich A. V.  ,   (1)General Physics Institute,Russia Academy of Sciences,Moscow 119991,Russia; (2)Institute of Radio Engineering & Electronics,Russia Academy of Sciences,Fryazino 141190,Russia; (3)北京科技大学材料学系,北京 100083; (4)北京科技大学材料学系,北京 100083;北京科技大学功能材料研究所,北京 100083; (5)北京科技大学材料学系,北京 100083;北京科技大学新金属材料国家重点实验室,北京 100083
Published: December 2020

The macro-texture, grain boundary distribution and surface morphology in CVD free standing diamond films deposited with different methane concentrations were observed by X ray diffraction, electron backscatter diffraction and SEM. The atom stacking process of twins on {111} planes of diamond crystal were studied. It is shown that the twins form easily on {111} planes because of the 〈111〉 60° orientation relationship of first order twin and the stacking structure of {111} planes. At low methane concentration, carbon atoms tend to deposit on {111} planes with lower surface energy, which facilitates the formation of twins by means of rotating deposition of carbon atoms, while the high twinning frequency weakens the texture. With increasing methane concentration the {001} planes with lower growing activation energy become the main frontal growth fronts, and only those grains with 〈001〉 crystal direction which is parallel to the surface normal can continuously grow, so that the probability of twin nucleation decreases. In addition, second_order twins were found in diamond film, and their formation mechanism was analyzed.
First-principles study of the p-type doped InN
Authors: Ding Shao-Feng  , Fan Guang-Han  , Li Shu-Ti  , Xiao Bing  ,   (1)华南师范大学光电子材料与技术研究所,广州 510631; (2)西安交通大学材料学院,西安 710049
Published: December 2020

The geometrical structure of Mg,Zn,Cd doped 32-atom supercell of InN was optimized using the ultra-soft pseudopotential method of total-energy plane wave based upon the density functional theory (DFT). Cell parameters of both doped and undoped cells were calculated theoretically. The binding energy, partial density of states, Mulliken charges, electron density differences of doped InN crystals were calculated and discussed in detail. The results revealed that compared with Zn and Cd, Mg substituting for In has the greatest solubility and yield more states of holes.So Mg is suitable for p-type doping of InN.
Grown-in oxygen precipitates in czochralski silicon investigated by transmission electron microscopy
Authors: Xu Jin  , Li Fu-Long  , Yang De-Ren  ,   (1)厦门大学化学化工学院材料科学与工程系, 厦门 361005; (2)浙江大学硅材料国家重点实验室, 杭州 310027
Published: December 2020

The grown-in oxygen precipitates in conventional Czochralski (CZ) silicon and nitrogen-doped Czochralski (NCZ) silicon have been investigated by means of transmission electron microscopy (TEM). Tiny oxygen precipitates about 5nm in size were observed in the NCZ specimens. It is believed that the oxygen precipitates may have grown from the heterogeneous nuclei of nitrogen-related complexes formed at a low temperature of 650℃.
Small signal gain characteristics of periodically arranged resonant amplifying media
Authors: Chen Fang  , Zeng Jian-Hua  , Zhou Jian-Ying  ,   中山大学光电材料与技术国家重点实验室，广州 510275
Published: December 2020

The characteristics of small signal gain are studied in a one-dimensional periodically arranged amplifying media. It is proved that the small signal gain characteristics shows special features with the increase of gain material length. The variation in gain is determined by the mutual competition between the photonic band gap formed by the refractive index of amplifying media and gain reaction under the resonant Bragg condition. Furthermore, we investigated the gain on the parameters of excitons and resonant atoms.
Investigation of the pressure-volume-temperature equation of state for dense hydrogen-helium mixture using multi-shock compression method
Authors: Tian Chun-Ling  , Cai Ling-Cang  , Gu Yun-Jun  , Jing Fu-Qian  , Chen Zhi-Yun  ,   (1)中国工程物理研究院流体物理研究所冲击波物理与爆轰物理实验室，绵阳 621900; (2)中国工程物理研究院流体物理研究所冲击波物理与爆轰物理实验室，绵阳 621900;西南大学物理系，重庆 400715
Published: December 2020

The multi-shock Hugoniot and shock temperatures of gaseous hydrogen-helium equimolar mixture with initial pressure and temperature of～30MPa and～90 K have been measured up to 140 GPa using two-stage light gas gun and shock reverberation technique. Two kinds of multi-channel pyrometer systems with different sensitivities, were used in experiment for diagnostics, because the thermal radiation of the sample in the first-shock state is lower than that in the multi-shocked states by a magnitude of one to two orders. The measured pressure, volume and temperature are respectively 5GPa, 12.0cm3/mol and 3030 K in the first-shock state, 27GPa, 6.7cm3/mol and 5070K in the second -shock state, and 105GPa, 4.0cm3/mol and 5090K in the fourth-shock state. The results for the first- and second-shock states are well described by the fluid perturbation theory and dissociation model. It demonstrates that the dissociation of molecular hydrogen of the compressed sample is negligible in the first-shock state, while about 7% and 32% of molecular hydrogen undergo dissociation in the second-and fourth-shock states, respectively. The fourth-shock temperature measured was lower than the prediction for～2000K.
Optical properties of the E0＋Δ0 energy level higher than the bandgap of GaAs studied by micro-photoluminescence technique
Authors: Bao Zhi-Hua  , Jing Wei-Ping  , Luo Xiang-Dong  , Tan Ping-Heng  ,   (1)南通大学江苏省专用集成电路设计重点实验室,南通 226007; (2)南通大学江苏省专用集成电路设计重点实验室,南通 226007;中国科学院半导体研究所超晶格国家重点实验室,北京 100083; (3)中国科学院半导体研究所超晶格国家重点实验室,北京 100083
Published: December 2020

Using micro-photoluminescence technique, we observed a new photoluminescence peak about 0.348eV above the bandgap of GaAs (E0). By analyzing its optical characteristics, we assigned this peak to the nonequilibrium luminescence emission from the E0＋Δ0 bandgap in semi-insulated GaAs, which was further verified by Raman results. The observed polarization, excitation power dependence and temperature dependence of the photoluminescence spectra from the E0＋Δ0 energy level were very similar to those from the E0 of GaAs. This mainly resulted from the common conduction band around Γ6 that was involved in the two optical transition processes, and indicated that the optical properties of bulk GaAs were mainly determined by the intrinsic properties of the conduction band. Our results demonstrated that the micro-photoluminescence technique is a powerful tool to investigate the high energy states above the fundamental bandgap in semiconductor materials.
A model simulation for anomalous annual cycle of vertical motion in the middle stratosphere
Authors: Zheng Bin  , Shi Chun-Hua  ,   (1)南京信息工程大学大气科学学院，南京 210044; (2)中国气象局广州热带海洋气象研究所，广州 510080
Published: December 2020

There is a pronounced antisymmetry with respect to the equator for the middle stratospheric methane, and it has been attributed to the anomalous annual cycle of vertical motions. The NCAR interactive chemical, dynamical and radiative two-dimensional model (SOCRATES) has been used to simulate and explore the possible cause of the anomalous annual cycle of vertical motions. The simulation results indicate that the quasi-biennial shift to the equator of high concentration ozone center plays an important role in the interannual anomaly of annual cycle. Ashigh concentration of ozone leaves the equator for the summer Hemisphere, there more solar radiation is absorbed in the middle stratosphere, while in the winter Hemisphere the situation is the contrary. Thus enhanced ascending motion is promoted by greater short-wavelength radiation heating in the middle stratosphere over the summer Hemisphere and strengthens the descending motion over the winter Hemisphere as well, which results in a stronger annual cycle. On the contrary, when high concentration of ozone is located close to the equator, there is a relatively weaker annual cycle.
Evolution of strategies based on genetic algorithm in the iterated prisoner’s dilemma on complex networks
Authors: Lin Hai  , Wu Chen-Xu  ,   厦门大学物理系，理论物理与天体物理研究所，厦门 361005
Published: December 2020

Using genetic algorithm, we studied the evolution of strategies in the iterated prisoner's dilemma on complex networks. It is found that the agents located on complex networks can naturally develop some self-organization mechanics of cooperation by genome reproduction, recombination, mutation and selection, which can not only result in the emergence of cooperation, but also strengthen and sustain the persistent cooperation. At the same time, such mechanics punishes and takes revenge on defective agents, leading to a high cooperation rate on complex networks.
Dromion soliton waves and the their evolution in the background of Jacobi sine waves
Authors: Ma Song-Hua  , Fang Jian-Ping  , Zhu Hai-Ping  ,   丽水学院物理系，丽水 323000
Published: December 2020

By an improved mapping approach, Bcklund transformation approach and a variable separation approach, a series of excitations of the (2+1)-dimensional generalized Breor-Kaup (GBK) system is derived. Based on the derived excitations, we find some complex waves of GBK equation. Then we discussed the evolution of dromion solitions in the background of the Jacobi sine waves.
Obtaining general soliton solutions of nonlinear Boussinesq equations by trigonometric function method
Authors: He Feng  , Guo Qi-Bo  , Liu Liao  ,   (1)北京师范大学物理系，北京 100875; (2)湖南科技大学物理学院，湘潭 411201
Published: December 2020

A suitable transformation (trigonometric function method) is found to change nonlinear Boussinesq differential equations into nonlinear algebra equations, which are solved by Wu elimination method and therewith the general soliton solutions of Boussinesq differential equations are obtained.
Nonlinear dynamical properties of susceptibility of a spinor Bose-Einstein condensate with dipole-dipole interaction in a double-well potential
Authors: Zang Xiao-Fei  , Li Ju-Ping  , Tan Lei  ,   兰州大学理论物理研究所，兰州 730000
Published: December 2020

Based on mean-field theory and single spatial mode approximation，we study the nonlinear dynamical properties of the susceptibility of total spin F=1 Bose-Einstein condensate with dipole-dipole interaction in a double-well potential. For certain initial states，we find that the susceptibility oscillation appears when λA+2λd=0. When λA+2λd≠0, the dynamical behavior of the system shows both oscillation and self-trapping of susceptibility.
A γ-ray integrated prototype system for the measurement of plutonium component attributes
Authors: Liu Su-Ping  , Hao Fan-Hua  , Gong Jian  , Wu Huai-Long  , Kang Wu  , Hu Guang-Chun  , Xiang Yong-Chun  , Nie Shi-Liang  , Hu Yong-Bo  , Chu Cheng-Sheng  , Zhang Jian-Hua  ,   (1)西南科技大学信息工程学院，绵阳 621010; (2)中国工程物理研究院核物理与化学研究所，绵阳 621900
Published: December 2020

A γ-ray integrated measurement prototype system named HAM-1 has been built up by integrating the technologies of γ-ray detection，spectral analysis and information barrier，which can be used for potential nuclear disarmament verification of plutonium components through the measurement of attributes such as the presence of plutonium，the weapon-grade plutonium and its age. A basic starting point for the development of HAM-1 was to prevent any possible leakage of sensitive weapon design information in the process of measurement. Two embedded ARM controllers were selected as the CPUs of HAM-1 according to the design requirements of information barriers. A code dedicated to HAM-1 has been developed for analyzing the high-resolution γ-ray spectra to accurately determine the attributes. The all-round process of HAM-1 from the spectra sampling to data processing and result display was automatic, during which the sensitive weapon design information was protected from leakage.
The structure and potential energy function of B2C(1A1) and BC2(2A′)
Authors: Liu Yu-Fang  , Han Xiao-Qin  , Lü Guang-Shen  , Sun Jin-Feng  ,   河南师范大学物理系，新乡 453007
Published: December 2020

Quadratic configuration interaction method including single and duble substitutions has been used to optimize the possible ground-state structures of B2C and BC2 molecules with the 6-311++G(d, f) and 6-311G(df, pd) basis set. The results show that the ground state of B2C molecule is of C2v symmetry and of 1A1 state, the ground state of BC2 molecule is of Cs symmetry and of 2A′ state. And the equilibrium geometry, dissociation energy, harmonic frequency and force constant have been calculated. The potential energy functions of B2C and BC2 have been derived from the many-body expansion theory. The potential energy functions describe correctly the configurations and the dissociation energies of the two ground-state molecules. Molecular reaction kinetics of B+BC→B2C and B+CC→BC2 based on the potential energy functions is discussed briefly.
Investigation of analytic potential energy function, vibrational levels and inertial rotation constants for the 23Πu state of spin-aligned dimer 7Li2
Authors: Shi De-Heng  , Sun Jin-Feng  , Liu Yu-Fang  , Ma Heng  , Zhu Zun-Lue  , Yang Xiang-Dong  ,   (1)河南师范大学物理与信息工程学院,新乡 453007; (2)河南师范大学物理与信息工程学院,新乡 453007;四川大学原子与分子物理研究所,成都 610065; (3)四川大学原子与分子物理研究所,成都 610065; (4)信阳师范学院物理电子工程学院,信阳 464000;河南师范大学物理与信息工程学院,新乡 453007;四川大学原子与分子物理研究所,成都 610065
Published: December 2020

Using the symmetry-adapted-cluster-configuration-interaction (SAC-CI) method provided by the Gaussian 03 program package, the potential energy curve for 7Li2(23Πu) has been calculated with the basis set 6-311++G(d,p) over the internuclear separation range from 0.13 to 2.0 nm. And the ab initio calculated points have been subjected to a least squares fitting to Murrell-Sorbie function. Employing the Rydberg-Klein-Rees method, the harmonic frequency is derived from the analytic potential energy function and then other spectroscopic data are further computed. These spectroscopic data are Te=3.6701eV, De=1.0764eV, Re=0.3000nm, ωe=285.69cm-1, ωeχe=1.8351cm-1, αe=0.00942cm-1 and Be=0.5340cm-1, respectively. In particular, the present Te, De, Re and ωe　values are in excellent agreement with other theoretical results. With the analytic potential energy function obtained on the SAC-CI/6-311++G(d,p) level, a total number of 67 vibrational states for the 23Πu state is found when J=0 by solving the radial Schrdinger equation of nuclear motion. The complete vibrational levels, classical turning points and inertial rotation constants for these vibrational states are also reported. The reasonable dissociation limit for the 23Πu state is deduced using the present results calculated.
Theoretical analysis and calculation of field parameters for magnetic multipole field
Authors: Li Guo-Feng  , Sun Ke-Chen  , Liang Ke  , Zheng Xu  , Ma Zhi-Qiao  , Wang Jin  ,   南开大学信息技术科学学院，天津 300071
Published: December 2020

According to the symmetry, Taylor series expansion formulas were derived for the magnetic multipole fields and field parameters were defined. Theoretical calculation formulas of field parameters of magnetic multipole field were obtained for saddle coils with the Biot_Savart law and the magnitudes of field parameter were analyzed. The rules of calculating field parameters and the high order derivatives of field parameters were also given. Our results may provide a theoretical basis for some applications of the magnetic multipole fields.
Effect of some factors on imaging quality of X-ray in-line outline imaging
Authors: Liu Li-Xiang  , Du Guo-Hao  , Hu Wen  , Xie Hong-Lan  , Xiao Ti-Qiao  ,   中国科学院上海应用物理研究所，上海 201800
Published: December 2020

The imaging quality of X-ray in-line outline imaging(XIOI)is mainly related to the size of samples, X-ray photon energy, X-ray scattering, distance from sample to detector Dsd and also distance from source to sample for point X-ray source and so on. To maximize the resolution of the image under the practical limitations of laboratorial equipment in distance from sample to detector and range of adjustable photon energy etc., the present paper studies the effect of the above factors on the imaging quality using numeral simulation. We obtained the relationship between imaging quality and photon energy, and not only found that there are certain X-ray photon energies which are equally well suitable for imaging but also found that we can get some high quality images for phase retrieval through which we can get the exact phase and absorption information. We have determined the precice Dsd values at which the imaging quality is the best for samples of different size, and found that Dsd is propertional to the sample size and determined the factor of proportionality. Though the diffuse scattering of X-ray reduces the contrast of images, we can still have good contrast when the variation in thickness is the order of the sample size when the scattering are only caused by the variation in thickness. So under these unfavorable conditions XIOI still performs effectively.
Properties of the phase evolution of two coupled atoms Raman interacting with squeezed vacuum field
Authors: Qian Yan  , Ma Ai-Qun  , Ma Zhi-Min  , Liu Zheng-Jun  , Liu Shu-Tian  ,   (1)广州大学城市建设学院，广州 510900; (2)哈尔滨工业大学物理系，哈尔滨 150001; (3)哈尔滨师范大学呼兰学院，哈尔滨 150050; (4)黑龙江大学物理科学与技术学院，哈尔滨 150080
Published: December 2020

The properties of the phase evolution of two coupled atoms Raman interacting with squeezed vacuum field are studied using the Pegg-Barnett phase theory. The phase probability distribution and variance are calculated. The evolution of the phase probability distribution functions in some cases are given by curves in the polar coordinate system. The influence of Raman interaction between the coupled atoms with squeezed vacuum field, the dipole-dipole interaction between the atoms and the initial states of atoms on the phase properties are discussed.
Investigation and design of widely tunable vertical-cavity surface emitting lasers
Authors: Guan Bao-Lu  , Guo Xia  , Yang Hao  , Liang Ting  , Gu Xiao-Ling  , Guo Jing  , Deng Jun  , Gao Guo  , Shen Guang-Di  ,   北京工业大学电子信息与工程控制学院，北京市光电子技术实验室，北京 100022
Published: December 2020

The tuning characteristics of widely tunable wavelength vertical-cavity surface-emitting lasers (VCSELs) have been investigated based on transfer matrix model and finite-element structure-electric coupled-field analysis model and experiment, in which the electrostatic tuning of wavelength and microelectronic mechanical system (MEMS) cantilever of the tunable VCSELs with central wavelength 980nm were designed. The analysis shows that the characteristics of wavelength tuning of VCSELs will be affected by the maximal displacement of cantilever and the structure of wavelength resonator. The tuning range can be improved based on the optimization of sacrificial layer for a given geometry of cantilever and active region of the device. In this paper, the structure of tunable VCSEL is designed. Further numerical simulations show that a continuous tuning range up to 32nm is obtainable, tuning efficiency is 0.12, and the whole tuning range of wavelength lies within the high gain region of the InGaAs quantum wells with GaAs barrier.
Effect of nonparaxiality of optical field on spectral shift and spectral switching
Authors: Zhao Guang-Pu  , Xiao Xi  , Lü Bai-Da  ,   (1)四川大学激光物理与化学研究所，成都 610064; (2)宜宾学院光电信息研究所，宜宾 644007; (3)宜宾学院光电信息研究所，宜宾 644007;四川大学激光物理与化学研究所，成都 610064
Published: December 2020

Based on the Rayleigh diffraction integral, an analytical expression for the spectrum of polychromatic Gaussian beams diffracted at an aperture is derived， and the paraxial results are treated as a special case of our general expression. The main attention is focused on the effect of ratio of the waist width to the central wavelength w0/λ0 and truncation parameter δ on spectral shift and spectral switching. Only when w0/λ0 and δ satisfy certain conditions are the paraxial approximation results consistent with the nonparaxial ones. The nonparaxiality of field results in different spectral shifts and changes of the critical position where the spectral switching takes place.