Purcell enhancement using spatially distributed random cavities enabled by silicon pyramid arrays

The tailored disorder explores light-matter interaction with various functionalities in solar photovoltaic, lasing, structural coloration, and quantum technologies. However, studies are limited to exploring tailored disorder-induced light scattering, while the interactions between emitters and random cavities still need to be analyzed. We demonstrate a significant Purcell-enhanced emission using random cavities in a spatially dispersed silicon (Si) pyramid array. The numerical simulation reveals spatial confinement of electric field intensity in the cavity with substantial Purcell enhancement for an embedded emitter. We experimentally verify Purcell enhancement using localized emitters coupled to Si pyramids, demonstrating fivefold enhanced emission intensity. We achieve a 67% reduction in emission lifetime for random cavity-coupled emitters, which depends on Si pyramid density across the sample, supported with numerical simulations. Our results put forward an amenable approach to tailoring random cavities to manipulate the emission properties of quantum emitters.