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arXiv 1809.02640physics.optics
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形变介质球光学共振的微扰理论

Perturbation theory of optical resonances of deformed dielectric spheres

Andrea Aiello, Jack G. E. Harris, Florian Marquardt

摘要:

我们分析了介质球的光学共振,其表面以任意方式轻微变形。建立一个二阶微扰级数,我们得到了频率偏移和修正线宽。我们的理论是适用的,例如,自由悬浮的液滴或固体球,这是由热表面振动,离心力或任意表面波变形。介质球实际上是一个开放系统,其描述需要引入非厄米特算子,其特征在于复特征值和不可归一化的特征函数。我们避免这些困难,使用Kapur-Peierls形式主义,使我们能够扩展流行的瑞利-薛定谔微扰理论的情况下,电磁德拜的潜力描述的光场内部和外部的近球形电介质对象。我们发现解析公式,在一定范围内有效,变形引起的第一和第二阶修正的中心频率和带宽的共振。作为我们的方法的应用,我们比较我们的结果与先前存在的发现完全一致。

英文摘要:

We analyze the optical resonances of a dielectric sphere whose surface has been slightly deformed in an arbitrary way. Setting up a perturbation series up to second order, we derive both the frequency shifts and modified linewidths. Our theory is applicable, for example, to freely levitated liquid drops or solid spheres, which are deformed by thermal surface vibrations, centrifugal forces or arbitrary surface waves. A dielectric sphere is effectively an open system whose description requires the introduction of non-Hermitian operators characterized by complex eigenvalues and not normalizable eigenfunctions. We avoid these difficulties using the Kapur-Peierls formalism which enables us to extend the popular Rayleigh-Schrödinger perturbation theory to the case of electromagnetic Debye's potentials describing the light fields inside and outside the near-spherical dielectric object. We find analytical formulas, valid within certain limits, for the deformation-induced first- and second-order corrections to the central frequency and bandwidth of a resonance. As an application of our method, we compare our results with preexisting ones finding full agreement.

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