Photonic analog of bilayer graphene

Drawing inspiration from bilayer graphene, this paper introduces its photonic analog comprising two stacked graphenelike crystals that are coupled in the near field through spoof surface plasmons. Beyond twist degree of freedom can radically alter band structure dispersion be also tailored via interlayer coupling which exhibits an exponential dependence on distance between crystals. We theoretically, numerically, and experimentally characterize structures $\mathit{AA}$- $\mathit{AB}$-stacked as well for twisted graphene with even odd sublattice exchange symmetries. Furthermore, we numerically predict existence magic angles associated ultraflat bands resulting hybridization. Finally, demonstrate at a particular angle satisfying symmetry is high-order topological insulator. The proposed could constitute useful platform identifying new quantum materials inspiring next-generation devices degrees emerging functionality.