We investigate how strong light–matter interactions can be used to engineer the radiative (light emission) properties of complex nanoscale systems composed of fluorescent dye molecules embedded in a polydopamine matrix and coupled to metallic nanoparticles. Polydopamine is a common biocompatible adhesive material, but it typically quenches fluorescence of embedded dyes through energy transfer processes, preventing efficient emission. By carefully tuning the energy levels of the molecules and nanoparticles to reach a strong matter–wave coupling regime, we demonstrate that this coupling can suppress fluorescence quenching, enabling efficient emission from dye molecules even inside the polydopamine host. This approach provides new insights into controlling light emission at the nanoscale and opens possibilities for improved imaging and sensing applications where conventional dye quenching is a problem.
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