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|Title:||Modeling quasi-dark states with temporal coupled-mode theory|
|Author:||Souza, M. C. M. M|
Rezende, G. F. M.
Barea, L. A. M.
Wiederhecker, G. S.
Frateschi, N. C.
|Abstract:||Coupled resonators are commonly used to achieve tailored spectral responses and allow novel functionalities in a broad range of applications. The Temporal Coupled-Mode Theory (TCMT) provides a simple and general tool that is widely used to model these devices. Relying on TCMT to model coupled resonators might however be misleading in some circumstances due to the lumped-element nature of the model. In this article, we report an important limitation of TCMT related to the prediction of dark states. Studying a coupled system composed of three microring resonators, we demonstrate that TCMT predicts the existence of a dark state that is in disagreement with experimental observations and with the more general results obtained with the Transfer Matrix Method (TMM) and the Finite-Difference Time-Domain (FDTD) simulations. We identify the limitation in the TCMT model to be related to the mechanism of excitation/decay of the supermodes and we propose a correction that effectively reconciles the model with expected results. Our discussion based on coupled microring resonators can be useful for other electromagnetic resonant systems due to the generality and far-reach of the TCMT formalism.|
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|Editor:||Optical Society of America|
|Citation:||Optics Express. Optical Soc Amer, v. 24, p. 18960 - 18972, 2016.|
|Appears in Collections:||IFGW - Artigos e Outros Documentos|
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