Figure 4
From: Dirac directional emission in anisotropic zero refractive index photonic crystals
Coherent multidirectional emission in anisotropic zero-refractive-index photonic crystal with 72° rhombic lattice.
(a)–(c) Locations of the five sources with same initial phases. The cases (a) and (b) have five-fold symmetry, same as the pentagonal device, while the position of the case (c) is random without rotational symmetry. (d) Far-field emission patterns. The directional patterns overlap well, regardless of all the three cases. (e) Same as (d) except in air.
