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arXiv 1202.6549math.AP
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Maxwell方程的Bloch波包衍射

Diffraction of Bloch Wave Packets for Maxwell's Equations

Grégoire Allaire, Mariapia Palombaro, Jeffrey Rauch

摘要:

我们研究了在O(h^2)调制下的h-周期介质中麦克斯韦方程组的1/h阶解。该解是建立在波长为h阶的Bloch平面波上的缓变振幅型解。我们构造了三尺度WKB型精确近似解。领先的配置文件都在群速度传输和分散的薛定谔方程给出的布洛赫色散关系的二次近似。弱射线平均假设保证了稳定性。与标量波方程的早期工作相比,生成器不再是椭圆形的。强制性只在无限维核的补集上成立。系统结构需要许多创新。

英文摘要:

We study, for times of order 1/h, solutions of Maxwell's equations in an O(h^2) modulation of an h-periodic medium. The solutions are of slowly varying amplitude type built on Bloch plane waves with wavelength of order h. We construct accurate approximate solutions of three scale WKB type. The leading profile is both transported at the group velocity and dispersed by a Schrödinger equation given by the quadratic approximation of the Bloch dispersion relation. A weak ray average hypothesis guarantees stability. Compared to earlier work on scalar wave equations, the generator is no longer elliptic. Coercivity holds only on the complement of an infinite dimensional kernel. The system structure requires many innovations.

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