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arXiv 1907.07529physics.opticsphysics.class-ph
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三维开放光学系统的共振态展开:一组完整的静态模式

Resonant-state expansion applied to three-dimensional open optical systems: A complete set of static modes

S. V. Lobanov, W. Langbein, E. A. Muljarov

摘要:

我们提出了两种替代的完整的静态模式的均匀介质球,他们使用的共振态展开(RSE),电动力学中的严格微扰方法。在物理上,需要这些模式来正确地描述由于介电常数的扰动而导致的光学系统内的电荷重新分布的静态电场。我们证明了收敛的RSE对精确的结果描述的基础球的大小减少的扰动。然后,我们重新审视在[Doost { \it et al.},Phys.Rev.A { \bf 90},013834(2014)],其中每个角动量仅引入单个静态模式,并且示出使用完整的静态模式集合导致RSE结果的小的但不可忽略的校正,从而改善与有限元模拟的一致性。作为另一个应用RSE与一组完整的静态模式的例子,我们计算了一个介质柱的谐振状态,也比较了结果与有限元模拟。

英文摘要:

We present two alternative complete sets of static modes of a homogeneous dielectric sphere, for their use in the resonant-state expansion (RSE), a rigorous perturbative method in electrodynamics. Physically, these modes are needed to correctly describe the static electric field of a charge redistribution within the optical system due to a perturbation of the permittivity. We demonstrate the convergence of the RSE towards the exact result for a perturbation describing a size reduction of the basis sphere. We then revisit the quarter-sphere perturbation treated in [Doost {\it et al.}, Phys. Rev. A {\bf 90}, 013834 (2014)], where only a single static mode per each angular momentum was introduced, and show that using a complete set of static modes leads to a small, though non-negligible correction of the RSE result, improving the agreement with finite-element simulations. As another example of applying the RSE with a complete set of static modes, we calculate the resonant states of a dielectric cylinder, also comparing the result with a finite-element simulation.

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