Exceptional points (EPs) in non-Hermitian metasurfaces give rise to unusual wave phenomena and have attracted considerable interest for photonic applications. However, the analysis and design of EP metasurfaces are typically based on coupled-mode theory, which often relies on spectral fitting and can become computationally demanding. Here, we develop a quasinormal mode (QNM) coupling framework for the physical analysis and forward design of EP metasurface systems. An automated EP search algorithm is introduced to efficiently identify optimal configurations. Within this framework, the coupled eigenfrequencies are obtained directly from the QNMs of the constituent resonators rather than spectral fitting. Furthermore, we apply the proposed approach to the design of an EP metasurface sensor and evaluate its sensing response. The results demonstrate that the method provides an efficient and physically grounded route to the analysis and design of various EP metasurfaces.

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• Metasurfaces
• Exceptional points
• Non-Hermitian systems