Propagation of the fundamental whispering gallery modes in a linear chain of microspheres
Propagation of the fundamental whispering gallery modes in a linear chain of microspheres
复制标题
微球线性链中基本回音壁模式的传播
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
A. Tünnermann
中科院分区：
文献类型：
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作者：
L. Deych;C. Schmidt;A. Chipouline;T. Pertsch;A. Tünnermann
利用多球Mie理论分析了线性微球链系统的谐振响应和电磁场的空间分布。我们假设该系统耦合到一个单色源，将激发一个基本的回音壁模式在一个单一的球体，并研究修改的谐振频率和空间分布的领域之间的光耦合引起的。我们发现，耦合模式的方法并没有给出一个充分的描述这种情况下，链的激发不能被呈现为线性组合的单球基本模式。在链与奇数微球的情况下，存在一个单一的集体模式的频率等于的单球共振，它再现了一个单球的基本模式的场图案没有失真的链的每一个奇数球。
Multi-sphere Mie theory is used to analyze the resonance response and the spatial distribution of the electromagnetic field in a system of a linear chain of microspheres. We assume that the system is coupled to a monochromatic source that would have excited a fundamental whispering gallery mode in a single sphere, and study the modification of the resonance frequencies and the spatial distribution of the field induced by optical coupling between spheres. We find that the coupled-mode approach does not give an adequate description of this situation, and that the excitations of the chain cannot be presented as linear combinations of the single-sphere fundamental modes. In the case of chains with an odd number of microspheres, there exists a single collective mode with frequency equal to that of the single-sphere resonance, which reproduces the field pattern of a single-sphere fundamental mode without distortion in every odd-numbered sphere of the chain.