Figure 3
From: Dirac directional emission in anisotropic zero refractive index photonic crystals
Dirac directional emission.
(a) Schematic view of five-beam directional emitter by using anisotropic zero-refractive-index photonic crystal with 72° rhombic lattice. Five pieces of triangular-profile structure are tiled in the x-y plane to form pentagonal shape and the exit facet is normal to the ΓX direction. (b) Ez output fields from the zero-refractive-index photonic crystal. (c) Output power from the pentagonal device constructed by anisotropic homogeneous mu-near-zero materials with the values of μx = 5.13 × 10−2 and μy = 3.25 × 10−3. The sharp peak is the result of impedance match when ε ≈ μ ≈ 0. (d) Ez fields from the pentagonal device when εz = 0.75 × 10−3 in (c). The electromagnetic indices are taken from Fig. 2(c).
