Exceptional Point and Strong Coupling of Anapoles Enhance Purcell Effect in All‐Dielectric Heterodimer Metasurface

ABSTRACT Dielectric Mie resonators are an example of non‐Hermitian systems where the light‐matter interaction at the nanoscale supports the continuum of scattering states. It is well established that such systems exhibit radiative and absorptive losses, relating to the frequency and decay rate, respectively. To utilize the significant properties of such non‐Hermitian systems, this work proposes to understand the anapole‐mediated resonance coupling in a silicon hetero‐dimer metasurface. The anapole–anapole interaction presents a strong coupling phenomenon under certain perturbations through an exceptional point transition. This coupling results in a Rabi splitting of 48.438 meV (11.7 THz). The concept of a two‐level atomic system is employed to establish a comparative analysis between the atomic transitions and the resonant modes in the proposed system, which demonstrates a clear analogy that captures the essence of strong coupling. This system provides deeper insight into the interaction dynamics governing the hybridized optical modes, which is a promising platform for achieving substantial Purcell enhancement and yielding the reduction in lifetime around the anapole resonance. Consequently, the proposed dimer structure paves the way toward developing photon–emitter interfaces that are essential for next‐generation photonic quantum networks.