Van der Waals two-dimensional material for dispersion-assisted Purcell enhancement

In this study, we investigate van der Waals two-dimensional materials, specifically Hexagonal Boron Nitride (hBN), to explore dispersion-assisted Purcell enhancement and light outcoupling enhancement. We examine the photonic density of states in conjunction with a dipole emitter near an hBN slab, revealing intriguing light-matter interactions governed by hyperbolic dispersion properties. Our results demonstrate that significant Purcell enhancement can be achieved for both type-II and type-I hyperbolic dispersions, independent of dipole orientation. Furthermore, we show that at specific wavelength ranges, substantial power can be extracted from the hBN slab for various dipole orientations. These findings are supported by detailed analytical calculations and numerical field mapping simulations. Notably, single-photon sources based on a simple hBN slab require minimal microfabrication and operate across a broad wavelength range, which is crucial not only for advancing fundamental photonic concepts but also for driving technological innovations in photonics and quantum applications.