Enhanced light–matter interaction in a hybrid photonic–plasmonic cavity

Strongly concentrated optical fields around a metal nanoparticle in the close vicinity of dipole noticeably facilitate dramatic changes localized density states due to hybrid photonic–plasmonic mode couplings as compared that pure cavity fields. Significant variations field intensity presence elucidate enhanced light–matter interaction structure. The enhancement factor is studied through single-atom cooperativity parameter, which directly proportional ratio fluorescence lifetimes off-resonant and on-resonant emission. A compact cost-effective device, includes microfiber cavity, supporting whispering gallery modes, well-defined solid nanostructure, consisting gold core, overcoated by silica shell, decorated with CdS/CdSe quantum dots, demonstrated offer an outstanding potential for interaction. Surface plasmons nanoparticle, placed inside hollow cylindrical nanostructure at surface microfiber, are activated upon excitation dipoles emitters, on-resonance mode. Time-resolved experiments demonstrate parameter dots about 4.8 being simultaneously strong nanoparticle’s plasmons.