Year: 2025
Type: article
Abstract: The rapid progress of nanophotonics demands theoretical frameworks capable of predicting the resonant behavior of complex systems comprising constituents of varying nature, operating beyond the weak-coupling, high-Q regime where classical temporal coupled-mode theory (CMT) is applicable. We present a coupled-quasinormal-mode framework for analyzing dissipative coupling with photonic and plasmonic resonators. The framework provides rigorous closed-form expressions for dissipative coupling coefficients and introduces novel features, such as a coupling scheme via time derivatives of excitation coefficients. It delivers transparent and accurate predictions of exotic phenomena—such as zero-coupling between very close cavities and level-attraction effects—that are only vaguely captured by traditional CMT models. Efficient and user-friendly, this framework facilitates rapid parameter space exploration for device design and offers potential for extension to nonlinear and quantum systems in future applications.
Source: Advanced Photonics
Authors: Tong Wu, Philippe Lalanne
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
Funder: Agence Nationale de la Recherche
Award: G2380881430
OpenAlex ID: W4415406067