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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Modeling quasi-dark states with temporal coupled-mode theory

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Souza, Mario C. M. M. ; Rezende, Guilherme F. M. ; Barea, Luis A. M. ; Wiederhecker, Gustavo S. ; Frateschi, Newton C.
Total Authors: 5
Document type: Journal article
Source: Optics Express; v. 24, n. 17, p. 18960-18972, AUG 22 2016.
Web of Science Citations: 6

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. (C) 2016 Optical Society of America (AU)

FAPESP's process: 08/57857-2 - Photonics for optical communications
Grantee:Hugo Luis Fragnito
Support type: Research Projects - Thematic Grants
FAPESP's process: 14/04748-2 - Coupled microresonators applied to signal processing and photonics integration
Grantee:Mário César Mendes Machado de Souza
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 12/17765-7 - Nanophotonics in Group IV and III-V semiconductors
Grantee:Gustavo Silva Wiederhecker
Support type: Research Grants - Young Investigators Grants