Synthetic Topological Nodal Phase in Bilayer Resonant Gratings

Abstract

The notion of synthetic dimensions in artificial photonic systems has received considerable attention as it provides novel methods for exploring hypothetical topological phenomena as well as potential device applications. Here, we demonstrate nanophotonic manifestation of a two-dimensional topological nodal phase in bilayer resonant grating structures. Using the mathematical analogy between a topological semimetal and vertically asymmetric resonant grating structures, we show that the interlayer shift simulates an extra momentum dimension for creating a two-dimensional topological nodal phase.