A few anisotropic van der Waals materials have been shown to host hyperbolic polaritons in the visible and infrared ranges. Here, the authors characterize the complex dielectric function of hexagonal boron nitride in the deep-ultraviolet regime, supporting a natural hyperbolic dispersion and predicting hyperbolic exciton polaritons.
- Bongjun Choi
- Jason Lynch
- Deep Jariwala
