Resonant States Reveal Strong Light–Matter Coupling in Nanophotonic Cavities

ABSTRACT Photonic resonances enable control over light–matter interactions, but many key phenomena only emerge in the strong‐coupling regime where light and matter excitations fully hybridize. To distinguish between weak and strong coupling, one conventionally studies real‐frequency spectra of the hybrid system. However, these spectra only provide indirect estimates of the underlying resonant dynamics, as the resonances reside at complex frequencies. To overcome this contradiction, we demonstrate that photonic resonant states provide a framework for unambiguously distinguishing between weak and strong coupling. Upon tracing the resonant states through the complex plane while changing the resonator geometry, their trajectories undergo a qualitative change at the onset of strong coupling. Instead of passing each other in the complex frequency plane with only perturbative interactions, the resonant states swap positions. Assuming a single dominant photonic resonance, we derive an effective Hamiltonian that captures the interaction with multiple material resonances, including direct access to coupling rates from overlap‐integrals. Our analysis reveals that, unlike most coupled‐oscillator models commonly employed, hybridization not only introduces off‐diagonal coupling but also shifts the bare eigenfrequency of the photonic mode. We apply our approach to planar and spherical silver resonators filled with a molecular material whose properties were extracted from quantum‐chemical simulations.