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arXiv 1111.4318nlin.PSphysics.optics
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非线性各向同性手征异向介质中的矢量孤子

Vector solitons in nonlinear isotropic chiral metamaterials

N. L. Tsitsas, A. Lakhtakia, D. J. Frantzeskakis

摘要:

从麦克斯韦方程组出发,利用约化微扰法导出了各向同性非线性手征材料中电磁场沿固定方向传播的两个Beltrami分量的耦合非线性薛定谔(NLS)方程组.用单共振Lorentz模型计算介电常数和磁导率,用Condon模型计算手征参数,在某些光谱区域,当忽略非线性和手征参数足够大时,两个Beltrami分量中的一个表现出负的实折射率。可能存在一个子区域,其中NLS方程的系统可以由Manakov系统近似。在该光谱子区中可以形成暗-亮、暗-暗和暗-亮矢量孤子。

英文摘要:

Starting from the Maxwell equations, we used the reductive perturbation method to derive a system of two coupled nonlinear Schrödinger (NLS) equations for the two Beltrami components of the electromagnetic field propagating along a fixed direction in an isotropic nonlinear chiral metamaterial. With single-resonance Lorentz models for the permittivity and permeability and a Condon model for the chirality parameter, in certain spectral regimes, one of the two Beltrami components exhibits a negative real refractive index when nonlinearity is ignored and the chirality parameter is sufficiently large.We found that, inside such a spectral regime, there may exist a subregime wherein the system of the NLS equations can be approximated by the Manakov system. Bright-bright, dark-dark, and dark-bright vector solitons can be formed in that spectral subregime.

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