Propagation of the fundamental whispering gallery modes in a linear chain of microspheres

L. I. Deych, C. Schmidt, A. Chipouline, T. Pertsch, A. Tünnermann

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7 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)21-30
Number of pages10
JournalApplied Physics B: Lasers and Optics
Volume93
Issue number1
DOIs
Publication statusPublished - Oct 2008
Externally publishedYes

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