一维光子晶体中亚波长缺陷膜对Goos-H(a)nchen位移的调制特性

利用传输矩阵法分析一维光子晶体中亚波长缺陷膜对缺陷模频率处Goos-H(a)nchen位移的调制特性,讨论了亚波长缺陷膜的厚度、磁导率及介电常量对一维光子晶体缺陷模频率处的Goos-H(a)nchen位移的影响.研究发现:一层几何厚度极小的亚波长薄膜即可非常灵敏地调制一维光子晶体缺陷模频率处Goos-H(a)nchen位移的位置及其大小;并且当亚波长缺陷膜为左手材料时,Goos-H(a)nchen位移随亚波长缺陷膜物理参量的变化趋势与普通右手材料时的情形完全相反.     

孤子和辐射场的非线性相互作用

利用穿衣服的方法推导出了在纯辐射场情况下Jost函数对的显式,由此得到了孤子与辐射场相互作用的解析表达式,发现脉冲在传输过程中,由于受到辐射场的作用,其振幅的演化在传播方向上是按照幂指数的负的平方根的规律衰减,并且将最终演化成一个类孤子的形式,且阐明了因子γ对光脉冲输出的光谱特性将会产生重要影响;并对辐射场的存在对类孤子演化的动力学行为作了分析. 关键词： 穿衣服方法 类孤子 孤子 辐射场     

微波激发下非线性磁表面波传播特性

研究了微波激发下非线性反铁磁晶体与线性铁磁晶体交界面上transverseelectric(缩写为TE)表面波的传播特性.用反函数形式给出了反铁磁晶体中TE表面波磁场的精确解.分析了小功率和大功率传输时的场分布特征.求得了TE表面波的色散方程,进而讨论了系统的微波频率特性.分析表明,非线性TE表面波存在频率通带和禁带,其带宽是功率的函数,通过调节导波功率可以有效地实现通带和禁带之间的转换 关键词： 反铁磁晶体 铁磁晶体 非线性表面波     

Bright-dark incoherently coupled soliton pairs composed of spatially incoherent solitons

It is shown that bright-dark incoherently coupled soliton pairs can exist in photorefractive (PR) crystals under steady-state conditions, each soliton constituent of which is spatially incoherent. The characteristics of bright-dark incoherently coupled soliton pairs are studied by the coherent density approach and the intensity expressions of soliton pairs are obtained. The propagation properties of coherent components of each constituent in a soliton pair are also discussed in detail.     

自聚焦克尔类电介质中非傍轴光束调制非稳的研究

将非傍轴效应等效为四阶空间色散、五阶非线性效应和自陡峭效应加以处理.利用线性稳定法研究非傍轴光束在非线性克尔介质中的传播稳定性.理论分析和数值模拟均表明，入射功率p₀和非傍轴参量a决定非傍轴光束调制非稳增益谱呈现出三种不同的分布规律，并给出相应判据以区分三种不同分布. 关键词： 非傍轴光束 调制非稳 增益谱 克尔介质     

Solitons in optical lattices with nonlocal nonlinearity

The propagation of spatial solitons is systematically investigated in nonlocal nonlinear media with an imprinted transverse periodic modulation of the refractive index. Based on the variational principle and the infinitesimal approximation of Maclaurin series expansion, we obtain an analytical solution of such nonlocal spatial solitons and an interesting result that the critical power for such solitons propagation is smaller than that in uniform nonlocal self-focusing media. It is found that there exist thresholds in modulation period and lattice depth for such solitons. A stable spatial soliton propagation is maintained with proper adjustment of the modulation period and the lattice depth.     

The propagation of dipole solitonsin highly nonlocal medium

This paper studies the propagation of dipole solitons in highly nonlocal medium by using the variational method. It finds that the dipole solitons will be stable when the input power obeys a restrict value. When the incident power does not satisfy the stable conditions, the nonlocal accessible dipole solitons will undergo linear harmonic oscillation. It shows such evolution behaviours in detail.