Content of CLASSICAL AREAS OF PHENOMENOLOGY in our journal

Published in last 1 year |  In last 2 years |  In last 3 years |  All Please wait a minute... For selected: Download citations EndNote Ris BibTeX Toggle thumbnails Select Energy unidirectional transmission in an asymmetrically finite transmission line Tao Feng(陶锋), Chen Wei-Zhong(陈伟中), Xu Wen(许文), and Du Si-Dan(都思丹) Chin. Phys. B, 2012, 21 (1): 014101.   DOI: 10.1088/1674-1056/21/1/014101 Abstract （1247）      PDF （456KB）（723）       Knowledge map    The phenomenon of energy unidirectional transmission is numerically investigated by using a system of two coupled discrete nonlinear electrical transmission lines, each line of the network contains a finite number of cells and has different pass band structures, respectively. Using numerical simulations, we examine the frequency multiplication of the driving frequency and the lattice filtering effect in the line. These lead to the generation of energy unidirectional transmission. In the present work, energy is carried by the second harmonic wave in the pass band. In addition, we also study the dependence of the energy efficiency on the driving amplitude and other parameters of the model, such as the system size and the nonlinear coefficient, by calculation. Furthermore, after detailed numerical simulation, an experimental demonstration is realized. The experimental results agree with those in simulation qualitatively. Select Wavefront correction of Ti:sapphire terawatt laser with varying precision of phase conjugation between deformable mirror and wavefront sensor Yu Liang-Hong(於亮红), Liang Xiao-Yan(梁晓燕), Ren Zhi-Jun(任志君), Wang Li(王利), Xu Yi(许毅), Lu Xiao-Ming(陆效明), and Yu Guo-Hao(于国浩) Chin. Phys. B, 2012, 21 (1): 014201.   DOI: 10.1088/1674-1056/21/1/014201 Abstract （1312）      PDF （296KB）（11135）       Knowledge map    The phase conjugation between the deformable mirror and the wavefront sensor in the aberration correction of a terawatt Ti:sapphire laser is studied experimentally and theoretically in this paper. At varying values of phase-conjugation precision, we focus the corresponding beams into spots of the same size of 5.1 μm×5.3 μm with a f/4 parabola in the 32 TW/36 fs Ti:sapphire laser system. The results show that the precision of conjugation can induce an intensity modulation but does not significantly affect the wavefront correction. Select Design of wideband graded-index antireflection coatings at oblique light incidence Zhang Jun-Chao(张俊超), Fang Ming(方明), Jin Yun-Xia(晋云霞), and He Hong-Bo(贺洪波) Chin. Phys. B, 2012, 21 (1): 014202.   DOI: 10.1088/1674-1056/21/1/014202 Abstract （1172）      PDF （243KB）（1156）       Knowledge map    We suggest a design method of graded-refractive-index (GRIN) antireflection (AR) coating for s-polarized or p-polarized light at off-normal incidence. The spectrum characteristic of the designed antireflection coating with a quintic effective refractive-index profile for a given state of polarization has been discussed. In addition, the genetic algorithm was used to optimize the refractive index profile of the GRIN antireflection for reducing the mean reflectance of s- and p-polarizations. The average reflectance loss was reduced to only 0.04% by applying optimized GRIN AR coatings onto BK7 glass over the wavelength range from 400 to 800 nm at the incident angle of θ0 =70°. Select Quantum correlations between two non-interacting atoms under the influence of a thermal environment Hu Yao-Hua(胡要花) and Wang Jun-Qiang(王军强) Chin. Phys. B, 2012, 21 (1): 014203.   DOI: 10.1088/1674-1056/21/1/014203 Abstract （1184）      PDF （209KB）（859）       Knowledge map    By considering a double Jaynes-Cummings model, we investigate the dynamics of quantum correlations, such as the quantum discord and the entanglement, for two atoms in their respective noisy environments, and study the effect of the purity and the cavity temperature on the quantum correlations. The results show that the entanglement suffers sudden death and revival, however the quantum discord can still reveal the quantum correlations between the two atoms in the region where the entanglement is zero. Moreover, when the temperature of each cavity is high the entanglement dies out in a short time, but the quantum discord still survives for quite a long time. It means that the quantum discord is more resistant to environmental disturbance than the entanglement at higher temperatures. Select Role of phase fluctuation and dephasing in the enhancing continuous variable entanglement of a two-photon coherent beat laser Sintayehu Tesfa Chin. Phys. B, 2012, 21 (1): 014204.   DOI: 10.1088/1674-1056/21/1/014204 Abstract （1237）      PDF （717KB）（671）       Knowledge map    A steady state analysis of the nonclassical features and statistical properties of the cavity radiation of a two-photon coherent beat laser is presented. Results show that the degree of two-mode squeezing, detectable entanglement and intensity of the cavity radiation can increase with the deviation of the phase fluctuations of the laser employed in preparing the atoms, but decrease with the increasing rate at which the induced coherence superposition decays. Although it is found that varying the phase fluctuations and dephasing can lead to modification in the quantum features and statistical properties of the radiation, it does not alter the similarity in the nature of the degree of entanglement detectable by the criteria following from Duan-Giedke-Cirac-Zoller and logarithmic negativity in a perceivable manner. Since the intensity and quantum features can be readily enhanced, this system is expected to be a viable source of a strong robust entangled (squeezed) light under various conditions. Moreover, comparison of the mean number of photon pairs with intensity difference shows that the chance of inciting a two-photon process can be enhanced by changing the rate of dephasing and phase fluctuations. Select The population and decay evolution of a qubit under the time-convolutionless master equation Huang Jiang(黄江), Fang Mao-Fa(方卯发), and Liu Xiang(刘翔) Chin. Phys. B, 2012, 21 (1): 014205.   DOI: 10.1088/1674-1056/21/1/014205 Abstract （1296）      PDF （119KB）（697）       Knowledge map    We consider the population and decay of a qubit under the electromagnetic environment. Employing the time-convolutionless master equation, we investigate the Markovian and non-Markovian behaviour of the corresponding perturbation expansion. The Jaynes-Cummings model on resonance is investigated. Some figures clearly show the different evolution behaviours. The reasons are interpreted in the paper. Select Characteristics of xenon-lamp pumped pyrromethene 567-doped dye laser based on polymethylmethacrylater Wang Lei(王磊), Chen De-Ying(陈德应), Xia Yuan-Qin(夏元钦) Fan Rong-Wei(樊荣伟), and He Wei-Ming(何伟明) Chin. Phys. B, 2012, 21 (1): 014206.   DOI: 10.1088/1674-1056/21/1/014206 Abstract （1186）      PDF （142KB）（680）       Knowledge map    The solid-state medium containing pyrromethene 567 (PM567) in a polymethylmethacrylate polymer host is shown to lase under the flash lamp excitation. The experimental setup is an ordinary industrial product without special design. The bulk transmission losses, the output energy, and the other lasing properties are compared. The medium with the lowest transmission loss, measured to be 0.392 %/cm at 633 nm, gives a laser output of 130 mJ with a slope efficiency of 0.082%. Select Efficient continuous-wave eye-safe region signal output from intra-cavity singly resonant optical parametric oscillator Li Bin(李斌), Ding Xin(丁欣), Sheng Quan(盛泉), Yin Su-Jia(殷苏嘉), Shi Chun-Peng(史春鹏), Li Xue(李雪), Yu Xuan-Yi(禹宣伊), Wen Wu-Qi(温午麒), and Yao Jian-Quan(姚建铨) Chin. Phys. B, 2012, 21 (1): 014207.   DOI: 10.1088/1674-1056/21/1/014207 Abstract （1275）      PDF （1820KB）（678）       Knowledge map    We report an efficient continuous-wave (CW) tunable intra-cavity singly resonant optical parametric oscillator based on the multi-period periodically poled lithium niobate and using a laser diode (LD) end-pumped CW 1064 nm Nd:YVO4 laser as the pump source. A highly efficiency CW operation is realized through a careful cavity design for mode matching and thermal stability. The signal tuning range is 1401-1500 nm obtained by varying the domain period. The maximum output power of 2.2 W at 1500 nm is obtained with a 17.1 W 808 nm LD power and the corresponding conversion efficiency is 12.9%. Select Generalization and propagation of spiraling Bessel beams with a helical axicon Sun Qiong-Ge(孙琼阁), Zhou Ke-Ya (周可雅), Fang Guang-Yu (方光宇), Liu Zheng-Jun(刘正君), and Liu Shu-Tian (刘树田) Chin. Phys. B, 2012, 21 (1): 014208.   DOI: 10.1088/1674-1056/21/1/014208 Abstract （1607）      PDF （354KB）（1733）       Knowledge map    A generalized type of spiral Bessel beam has been demonstrated by using a spatially displaced helical axicon (HA). The topological charge of the spiraling Bessel beams is determined by the order of the input Laguerre-Gaussian (LG) beam and the topological charge of the HA. The obtained spiraling Bessel beams have an LG type of modulation along their propagation direction and exhibit annihilation-reconstruction properties. Theoretical analysis is presented, including that of the stability, propagation distance, topological charge, and spiraling dynamic characteristics. The mathematical and numerical results show that the propagation distance and helical revolution of the spiraling Bessel beams can be controlled through choosing appropriate radius of the HA. Select Mode-I crack in a two-dimensional fibre-reinforced generalized thermoelastic problem Kh. Lotfy Chin. Phys. B, 2012, 21 (1): 014209.   DOI: 10.1088/1674-1056/21/1/014209 Abstract （1291）      PDF （324KB）（1052）       Knowledge map    A general model of the equations of the Lord-Şulman theory including one relaxation time and the Green-Lindsay theory with two relaxation times, as well as the classical dynamical coupled theory, are applied to the study of the influence of reinforcement on the total deformation for an infinite space weakened by a finite linear opening mode-I crack. We study the influence of reinforcement on the total deformation of rotating thermoelastic half-space and their interaction with each other. The material is homogeneous isotropic elastic half space. The crack is subjected to prescribed temperature and stress distributions. The normal mode analysis is used to obtain the exact expressions for displacement components, force stresses, and temperature. The variations of the considered variables with the horizontal distance are illustrated graphically. Comparisons are made with the results obtained in the three theories with and without rotation. A comparison is also made between the two theories for different depths. Select Optical terminal analysis of a multigrating tiled compressor in a PW-class CPA-laser Yang Yu-Chuan(杨雨川), Luo Hui(罗晖), Wang Xiao(王逍), Li Fu-Quan(李富全), Huang Xiao-Jun(黄小军), and Jing Feng(景峰) Chin. Phys. B, 2012, 21 (1): 014210.   DOI: 10.1088/1674-1056/21/1/014210 Abstract （1183）      PDF （634KB）（803）       Knowledge map    In the highest-power chirped-pulse amplification lasers, the pulse must be stretched in time, amplified, compressed in a grating compressor and subsequently focused by off-axis parabola to obtain a high peak power. In the optical terminal, the temporal and spatial effects of mismatched multigrating tiled compressor on the far-field pulse are critical factors to be analysed. In this paper, a k-space raytracing model is proposed for the temporal and spatial analyses of possible errors in a four-grating single-pass tiled compressor. The results show that the last grating affects mainly the partial focal spot, while the middle two gratings affect the temporal waveform, and the partial focal spot needs much higher error control than that in the temporal domain in a picosecond pulse compression. Select Low temperature laser absorption spectra of methane in the near-infrared at 1.65 μm for lower state energy determination Gao Wei(高伟), Chen Wei-Dong(陈卫东), Zhang Wei-Jun(张为俊), Yuan Yi-Qian(袁怿谦), and Gao Xiao-Ming(高晓明) Chin. Phys. B, 2012, 21 (1): 014211.   DOI: 10.1088/1674-1056/21/1/014211 Abstract （1386）      PDF （525KB）（706）       Knowledge map    Direct absorption spectra of the 2v3 band of methane (CH4) from 6038 to 6050 cm-1 were studied at different low temperatures using a newly developed cryogenic cell in combination with a distributed feedback (DFB) diode laser. The cryogenic cell can operate at any stabilized temperature ranging from room temperature down to 100 K with temperature fluctuation less than ±1 K within 1 hour. In the present work, the CH4 spectra in the range of 6038-6050 cm-1 were recorded at 296, 266, 248, 223, 198, and 176 K. The lower state energy E″ and the rotational assignment of the angular momentum J were determined by a “2-low-temperature spectra method” using the spectra recorded at 198 and 176 K. The results were compared with the data from the GOSAT and the recently reported results from Campargue and co-workers using two spectra measured at room temperature and 81 K. We demonstrated that the use of a 2-low-temperature spectra method permits one to complete the E″ and J values missed in the previous studies. Select Electromagnetic scattering of the carbon nanotubes excited by an electric line source Wang Yue(王玥), Wu Qun(吴群), Wu Yu-Ming(吴昱明), He Xun-Jun(贺训军), and Li Le-Wei(李乐伟) Chin. Phys. B, 2012, 21 (1): 014212.   DOI: 10.1088/1674-1056/21/1/014212 Abstract （1291）      PDF （1047KB）（980）       Knowledge map    An analytical solution is presented for the electromagnetic scattering from an infinite-length metallic carbon nanotube and a carbon nanotube bundle. The scattering field and scattering cross section are predicted using a modal technique based on a Bessel and Hankel function for the electric line source and a quantum conductance function for the carbon nanotube. For the particular case of an isolated armchair (10, 10) carbon nanotube, the scattered field predicted from this technique is in excellent agreement with the measured result. Furthermore, the analysis indicates that the scattering pattern of an isolated carbon nanotube differs from that of the carbon nanotube bundle of identical index (m, n) metallic carbon nanotubes. Select Influence of limited-view scanning on depth imaging of photoacoustic tomography Wu Dan(吴丹), Tao Chao(陶超), Liu Xiao-Jun(刘晓峻), and Wang Xue-Ding(王学鼎) Chin. Phys. B, 2012, 21 (1): 014301.   DOI: 10.1088/1674-1056/21/1/014301 Abstract （1158）      PDF （457KB）（682）       Knowledge map    We study the influence of limited-view scanning on the depth imaging of photoacoustic tomography. The situation, in which absorbers are located at different depths with respect to the limited-view scanning trajectory, is called depth imaging and is investigated in this paper. The results show that limited-view scanning causes the reconstructed intensity of deep absorbers to be weaker than that of shallow ones and that deep absorbers will be invisible if the scanning range is too small. The concept of effective scanning angle is proposed to analyse that phenomenon. We find that an effective scanning angle can well predict the relationship between scanning angle and the intensity ratio of absorbers. In addition, limited-view scanning is employed to improve image quality. Select Phonon relaxation and heat conduction in one-dimensional Fermi–Pasta–Ulam β lattices by molecular dynamics simulations Hou Quan-Wen(侯泉文) and Cao Bing-Yang(曹炳阳) Chin. Phys. B, 2012, 21 (1): 014401.   DOI: 10.1088/1674-1056/21/1/014401 Abstract （1285）      PDF （195KB）（773）       Knowledge map    The phonon relaxation and heat conduction in one-dimensional Fermi-Pasta-Ulam (FPU) β lattices are studied by using molecular dynamics simulations. The phonon relaxation rate, which dominates the length dependence of the FPU β lattice, is first calculated from the energy autocorrelation function for different modes at various temperatures through equilibrium molecular dynamics simulations. We find that the relaxation rate as a function of wave number k is proportional to k1.688, which leads to a N0.41 divergence of the thermal conductivity in the framework of Green-Kubo relation. This is also in good agreement with the data obtained by non-equilibrium molecular dynamics simulations which estimate the length dependence exponent of the thermal conductivity as 0.415. Our results confirm the N2/5 divergence in one-dimensional FPU β lattices. The effects of the heat flux on the thermal conductivity are also studied by imposing different temperature differences on the two ends of the lattices. We find that the thermal conductivity is insensitive to the heat flux under our simulation conditions. It implies that the linear response theory is applicable towards the heat conduction in one-dimensional FPU β lattices. Select Directed segregation in compartmentalized bi-disperse granular gas Sajjad Hussain Shah, Li Yin-Chang(李寅阊), Cui Fei-Fei(崔非非), Zhang Qi(张祺), and Hou Mei-Ying(厚美瑛) Chin. Phys. B, 2012, 21 (1): 014501.   DOI: 10.1088/1674-1056/21/1/014501 Abstract （1323）      PDF （533KB）（585）       Knowledge map    A bi-disperse granular gas in an asymmetrical two-compartment system is studied experimentally. The presence of asymmetry within the range of our experimental parameters results in a directed segregated state and a directed clustering state. This deterministic system does not depend on the initial conditions. A modified flux model based on Lohse's flux model for bi-disperse granular gases is derived. The modified flux model explains qualitatively the experimental results. Select Generalized thermoelsticity of the thermal shock problem in an isotropic hollow cylinder and temperature dependent elastic moduli Ibrahim A. Abbas and Mohamed I. A. Othman Chin. Phys. B, 2012, 21 (1): 014601.   DOI: 10.1088/1674-1056/21/1/014601 Abstract （1444）      PDF （890KB）（1004）       Knowledge map    In this paper, we construct the equations of generalized thermoelasicity for a non-homogeneous isotropic hollow cylider with a variable modulus of elasticity and thermal conductivity based on the Lord and Shulman theory. The problem has been solved numerically using the finite element method. Numerical results for the displacement, the temperature, the radial stress, and the hoop stress distributions are illustrated graphically. Comparisons are made between the results predicted by the coupled theory and by the theory of generalized thermoelasticity with one relaxation time in the cases of temperature dependent and independent modulus of elasticity. Select Choice of optimal crystal-orientation for terahertz transceiver with zincblende crystal Tian Xiao-Guang(田晓光), Ling Fu-Ri(凌福日), He Jian(何健), Liu Jin-Song(刘劲松), and Yao Jian-Quan(姚建铨) Chin. Phys. B, 2011, 20 (12): 124201.   DOI: 10.1088/1674-1056/20/12/124201 Abstract （1321）      PDF （231KB）（1213）       Knowledge map    This paper presents a set of equations describing the terahertz generation and electro-optic detection based on optical rectification in zincblende crystals. The dependence of terahertz emission efficiency on the polarization of incident beam and crystal-orientation is discussed. For the experimental setup with a transceiver which transmits and detects terahertz radiation in the same crystal, we have demonstrated the optimal combination of both parameters above to optimize the working efficiency. Equations supplied in this paper are valid for zincblende crystals with arbitrary crystal-orientation and every possible polarization of an incident beam, which are of great significance for the optimization of a system. Select Negative refractive index in a four-level atomic system Zhang Zhen-Qing(张振清), Liu Zheng-Dong(刘正东), Zhao Shun-Cai(赵顺才), Zheng Jun(郑军), Ji Yan-Fang(姬艳芳), and Liu Nian(刘念) Chin. Phys. B, 2011, 20 (12): 124202.   DOI: 10.1088/1674-1056/20/12/124202 Abstract （1262）      PDF （145KB）（780）       Knowledge map    A closed four-level system in atomic vapour is proposed, which is made to possess left handedness by using the technique of quantum coherence. The density matrix method is utilized in view of the rotating-wave approximation and the effect of a local field in dense gas. The numerical simulation result shows that the negative permittivity and the negative permeability of the medium can be achieved simultaneously (i.e. the left handedness) in a wider frequency band under appropriate parameter conditions. Furthermore, when analysing the dispersion property of the left-handed material, we can find that the probe beam propagation can be controlled from superluminal to subluminal, or vice versa via changing the detuning of the probe field. Select Normal mode splitting and ground state cooling in a Fabry–Perot optical cavity and transmission line resonator Chen Hua-Jun(陈华俊) and Mi Xian-Wu(米贤武) Chin. Phys. B, 2011, 20 (12): 124203.   DOI: 10.1088/1674-1056/20/12/124203 Abstract （1243）      PDF （712KB）（790）       Knowledge map    Optomechanical dynamics in two systems which are a transmission line resonator and Fabrya-Perot optical cavity via radiation-pressure are investigated by linearized quantum Langevin equation. We work in the resolved sideband regime where the oscillator resonance frequency exceeds the cavity linewidth. Normal mode splittings of the mechanical resonator as a pure result of the coupling interaction in the two optomechanical systems is studied, and we make a comparison of normal mode splitting of mechanical resonator between the two systems. In the optical cavity, the normal mode splitting of the movable mirror approaches the latest experiment very well. In addition, an approximation scheme is introduced to demonstrate the ground state cooling, and we make a comparison of cooling between the two systems dominated by two key factors, which are the initial bath temperature and the mechanical quality factor. Since both the normal mode splitting and cooling require working in the resolved sideband regime, whether the normal mode splitting influences the cooling of the mirror is considered. Considering the size of the mechanical resonator and precooling the system, the mechanical resonator in the transmission line resonator system is easier to achieve the ground state cooling than in optical cavity. page Page 1 of 65 Total 1288 records First page Prev page Next page Last page