Abstract:
The electromagnetic response of a two-dimensional metal embedded in a periodic array of a dielectric host
can give rise to a plasmonic Dirac point that emulates epsilon-near-zero (ENZ) behavior. This theoretical result is
extremely sensitive to structural features like periodicity of the dielectricmedium and thickness imperfections.We
propose that such a device can actually be realized by using graphene as the two-dimensional metal and materials
like the layered semiconducting transition-metal dichalcogenides or hexagonal boron nitride as the dielectric
host. We propose a systematic approach, in terms of design characteristics, for constructing metamaterials with
linear, elliptical, and hyperbolic dispersion relations which produce ENZ behavior, normal or negative diffraction