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We show that the photonic crystal (PhC) made of dielectric cuboids with their centers forming a honeycomb lattice is characterized by aℤ  2${\mathbb{&amp;#x2124;}}_{2}$topological index when the longer sides of six cuboids point towards the center of hexagonal unit cell. While the  C  6 v   symmetry regarding the center of unit cell is preserved, the  C  3  symmetry regarding honeycomb sites is broken, which opens a bandgap in the Dirac dispersion of honeycomb structure and induces a band inversion between  p  modes and  d  modes. Rotating cuboids around their individual centers closes the bandgap and reopens a trivial bandgap. We discuss that this feature can be exploited for realizing a reconfigurable topological waveguide.

Reconfigurable topological waveguide based on honeycomb lattice of dielectric cuboids