| Full text | |
| Author(s): |
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 |
| 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. (C) 2016 Optical Society of America (AU) | |
| FAPESP's process: | 08/57857-2 - Photonics for optical communications |
| Grantee: | Hugo Luis Fragnito |
| Support Opportunities: | 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 Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 12/17765-7 - Nanophotonics in Group IV and III-V semiconductors |
| Grantee: | Gustavo Silva Wiederhecker |
| Support Opportunities: | Research Grants - Young Investigators Grants |