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Morphology-dependent resonances in homogeneous and core-shell nonspherical particles
Physical Review A ( IF 2.6 ) Pub Date : 2021-09-10 , DOI: 10.1103/physreva.104.033512
Benjamin Vennes , Thomas C. Preston

We formulate a perturbation theory for determining the frequencies of quasinormal modes in dielectric nonspherical core-shell particles. The theory is based on the extended boundary condition method (also known as the null-field method), which is used to represent the internal field in terms of a matrix Q. In this framework, the excitation of a morphology-dependent resonance corresponds to a vanishing eigenvalue of the Q matrix, which can be determined using perturbation techniques to yield explicit formulas for the corresponding eigenfrequency. We specialize our results to the case of a core-shell spherical particle that has been deformed into a spheroid and provide a comparison between numerical simulations and the perturbation theory. Excellent agreement is found for the small perturbations considered here. Further, we investigate the eigenfrequencies of core-shell particles for an extensive range of parameters.

中文翻译:

均质和核壳非球形颗粒中依赖于形态的共振

我们制定了一种微扰理论,用于确定介电非球形核壳粒子中准正规模式的频率。该理论基于扩展边界条件法(也称为零场法),用于用矩阵表示内部场. 在这个框架中,形态相关共振的激发对应于消失的特征值矩阵,可以使用微扰技术来确定,从而为相应的特征频率生成明确的公式。我们将我们的结果专门用于已变形为球体的核壳球形粒子的情况,并提供数值模拟与微扰理论之间的比较。对于这里考虑的小扰动,发现了极好的一致性。此外,我们针对广泛的参数范围研究了核壳颗粒的特征频率。
更新日期:2021-09-12
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