Figure 1
From: Optimal design of lattice structures for controllable extremal band gaps

Triangular lattice structure. (a) Unit cell and irreducible first Brillouin zone. (b) Design parameterization.
From: Optimal design of lattice structures for controllable extremal band gaps
Triangular lattice structure. (a) Unit cell and irreducible first Brillouin zone. (b) Design parameterization.