Dual-channel spontaneous emission enhancement metasurfaces in mid-infrared based on anapole state

Controlling spontaneous emission from electric dipole (ED) and magnetic dipole (MD) is crucial for quantum light sources, molecular sensing, and integrated quantum photonics. Enhancing these processes relies on intense, resonant local fields to boost the local density of optical states (LDOS). While conventional plasmonic structures provide strong fields, their performance is severely limited by inherent ohmic losses. We designed and experimentally verified a germanium based metasurface exciting a nonradiative anapole state to overcome this limitation. This approach generates extreme near-field enhancement, achieving significant field enhancement and improving light-matter interactions. We demonstrate dual-channel Purcell enhancement for both ED and MD emitters in the mid-infrared, with factors reaching 6057 and 2272, respectively. The quality factor, field enhancement, and Purcell factors of the resonator are precisely tunable by adjusting its geometric parameters. This work provides a robust platform for dual-dipole emission engineering, paving the way for high-performance quantum light sources, molecular fingerprinting, and on-chip quantum devices in the mid-infrared.