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使用改进的齐次平衡方法,研究了破裂孤子方程的孤子解结构,发现它具有单孤子解,单曲线孤子解,单dromion孤子解,多dromion孤子解。 相似文献
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提出了一个考虑背景光光伏效应贡献的光伏孤子理论,它指出在折射率变化为正的晶体中,既可产生光伏亮孤子,也可产生光伏暗孤子.当背景光对信号光的有效Glass系数之比为R小于1时,孤子是亮的;R大于1时,孤子是暗的.对亮孤子而言,R值越大,孤子越宽,而对暗孤子,R值越大,孤子越窄.当R为1时,不能形成光伏孤子.一维暗孤子实验结果与理论一致.
关键词:
光折变空间孤子
光伏孤子
暗孤子
正折射率改变 相似文献
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研究了一维非局域非线性耦合器中多极亮孤子的存在条件和稳定传输.用牛顿迭代法得到了二极和三极亮孤子.由于较强的非局域响应诱导孤子间的吸引作用比排斥作用大,此时二极孤子不能稳定传输,两孤子相互吸引,融合成一个孤子.随着非局域参数的减小,非线性效应和衍射效应达到平衡时,二极孤子能稳定传播.随着传播常数的减小,孤子的幅值减小,束宽变窄,使得孤子能稳定传播.对于三极亮孤子,在非局域参数较小的时候,耦合的两个三极孤子都不能进行稳定传输.传输一段距离后三极孤子发生碰撞,融合成两极孤子,两极孤子继续传输,最终融合成为一束振荡的光束.随着非局域参数的增大,三极孤子传播的稳定性增强.当传播常数取负数时,随着其绝对值的减小,三极亮孤子的幅值增大,束宽减小,孤子传播的稳定性增强.最后,通过加入白噪声进一步验证了这些亮孤子传播稳定性. 相似文献
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在Hartree平均场近似和高温近似下,本文建立了φ~4模型和非拓扑孤子袋模型的某些特解间确定的映射关系。从映射关系我们看到φ~4场的非球对称拓扑孤子和反孤子配对形成束缚态——孤子袋模型的非球对称非拓扑孤子解。当拓扑孤子和反孤子消失时,φ~4模型发生对称性恢复相交;当拓扑孤子和反孤子的束缚态非拓扑孤子消失时,孤子袋模型的退禁闭相变发生。 相似文献
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An optically addressed parallel-aligned nematic-liquid-crystal spatial light modulator (PAL-SLM) has been studied as a dynamic phase-only modulation device. A computer control feature of the spatial light modulator is strongly desired for practical applications. For those demands, an electrically-addressable phase-only spatial light modulator has been developed to combine a liquid crystal display (LCD) with a PAL-SLM (LCD-coupled PAL-SLM) and its performance has been reported. However, a temporal characteristic especially two-dimensional (2D) response has not been discussed before. In this paper, 2D response analysis system has been constructed by using a high-speed complementary Metal-Oxide-Semiconductor (CMOS) camera (1000 frames/sec) and the 2D-modulation characteristic of the LCD-coupled PAL-SLM has been observed. As a result, the LCD has a spatially non-uniform modulation characteristic due to a scanning addressing. It has the potential to cause problems in high speed switching for a computer generated hologram. On the other hand, the spatial non-uniformity has not been observed with the LCD-coupled PAL-SLM. 相似文献
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A. S. Sabirov 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2012,6(2):343-347
A carbon nanotube has been simulated in the form of a cylindrical layer with a given dielectric function, taking into account
the temporal dispersion of the medium. Quantization of the intrinsic electrical oscillations of a carbon nanotube electron
subsystem has been performed. The polarization potential, which arises when a charged particle moves near a carbon nanotube,
has been calculated and the energy loss caused by the excitation of surface plasmons has been obtained. 相似文献
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The system of nonlinear equations describing a surface-stabilized ferroelectric smectic C* liquid crystal in the chevron geometry has been investigated by numerical methods in the framework of the continuum model
of liquid crystals. Stable orientational and structural configurations have been studied, and the results obtained have been
compared with those derived using simplified models. The height of the potential barrier separating two stable configurations
has been determined, and the transition between them under the action of the external electric field has been examined. It
has been demonstrated that this effect has a threshold character. The dependence of the threshold field on the film thickness
has been analyzed. 相似文献
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V. A. Kashurnikov A. N. Maksimova I. A. Rudnev D. S. Odintsov 《Physics of the Solid State》2016,58(8):1505-1512
The magnetization of a layered high-temperature superconductor with different anisotropy parameters has been calculated using the Monte Carlo method in the framework of a modified three-dimensional Lawrence–Doniach model with actual boundary conditions. The penetration of a magnetic flux into a bulk sample from the boundary has been simulated, and the curves of magnetization reversal of a high-temperature superconductor by an external magnetic field have been calculated for different anisotropy parameters γ and types of defects in the sample. It has been found that there are significant differences in the magnetization curves and transport properties of superconductors with different anisotropy parameters γ. The influence of tilted columnar defects on the critical current has been analyzed. A decreasing dependence of the critical current on the tilt angle of defects with respect to the c axis has been obtained. It has been shown that, as the anisotropy parameter increases, this dependence weakens and, for a specific value of γ, disappears. An explanation of the mechanism responsible for the disappearance of the dependence has been proposed. 相似文献
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A family of highly sensitive devices based on a graphene nanobridge and superconducting electrodes has been developed, manufactured,
and examined. These devices can be used to create a graphene-based integral receiver. A cold-electron bolometer prototype
with superconductor-insulator-normal metal tunnel junctions has been studied. Its response to a change in the temperature
and external microwave radiation has been measured. A superconducting quantum interferometer with a graphene strip as a weak
coupling between superconducting electrodes has been examined. The corresponding modulation of the voltage by a magnetic field
at a given current has been measured. The effect of the gate voltage on the resistance of graphene has been analyzed for these
samples. To confirm that graphene is single-layer, measurements with the reference samples were performed in high magnetic
fields, displaying the half-integer quantum Hall effect. 相似文献
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Entanglement has been explored as one of the key resources required for quantum computation, the functional dependence of the entanglement measures on spin correlation functions has been established, correspondence between evolution of maximally entangled states (MES) of two-qubit system and representation of SU(2) group has been worked out and the evolution of MES under a rotating magnetic field has been investigated. Necessary and sufficient conditions for the general two-qubit state to be maximally entangled state (MES) have been obtained and a new set of MES constituting a very powerful and reliable eigen basis (different from magic bases) of two-qubit systems has been constructed. In terms of the MES constituting this basis, Bell’s States have been generated and all the qubits of two-qubit system have been obtained. It has shown that a MES corresponds to a point in the SO(3) sphere and an evolution of MES corresponds to a trajectory connecting two points on this sphere. Analysing the evolution of MES under a rotating magnetic field, it has been demonstrated that a rotating magnetic field is equivalent to a three dimensional rotation in real space leading to the evolution of a MES. 相似文献
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In this paper, evaporation waves appearing at rapid depressurization of a vessel filled with liquid Freon R11 have been investigated
experimentally. Regimes with a high-speed evaporation front have been revealed. It has been shown that the disintegration
of a metastable liquid takes place in the form of a surface evaporation wave with a cellular structure of the front and anomalously
high values of the coefficient of heat transfer from the liquid. The dependence of the evaporation front velocity on the initial
temperature of the liquid has been obtained. A critical temperature value below which evaporation waves are not observed has
been determined. Visualization of the evaporation front structure and dynamics with the use of a high-speed video camera has
been performed. It has been found that the evaporation front motion has a pulsatory character. A method to calculate the surface
evaporation wave with a quasi-plane interphase boundary has been developed. It is based on a model of nonequilibrium evaporation
of the liquid and experimentally measured coefficients of the heat transfer from the liquid. 相似文献
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Analysis and design of ring-resonator integrated hemi-elliptical lens antenna at terahertz frequency
In this paper, a novel lens integrated ring-resonator microstrip antenna is analyzed and simulated at 600 GHz. A mathematical model to compute the directivity of this kind of the antenna has been developed and the directivity of the antenna has been computed which is 18 dBi. The proposed model has been simulated by using CST Microwave Studio a commercially available simulator based on finite integral technique and similar result has been obtained. Further, the directivity of the antenna has also been computed by using the techniques reported in the literature and in this case also we have obtained the similar result. Later, a probe-fed patch integrated lens antenna has also been investigated to validate the correctness of the numerical method. To find the potential advantages of this kind of the structure, the ? 10 dB impedance bandwidth of the antenna has been compared to a lens-integrated probe-fed microstrip patch antenna and a significant enhancement in the bandwidth has been observed. 相似文献
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D. A. Baghdasaryan D. B. Hayrapetyan E. M. Kazaryan 《Journal of Contemporary Physics (Armenian Academy of Sciences)》2016,51(2):157-161
In a uniformly charged prolate spheroidal Thomson hydrogen atom the electron states have been investigated. It has been shown from the mathematical point of view that the problem is equivalent to a spheroidal hydrogen atom in a parabolic potential with the cylindrical symmetry. In the framework of adiabatic approximation, the energy of ground state has been calculated. Comparison with the case of uncharged spheroidal quantum dot has been made, and the analytical form of wave function of electron has been also obtained. 相似文献