Photonic band structure in a 2D honeycomb lattice of triangular holes

In this study, we calculate the photonic band structure for a honeycomb two-dimensional photonic crystal lattice composed triangular holes embedded in GaAs. We assume that the GaAs dielectric function depends on the applied hydrostatic pressure and temperature. The plane wave expansion method is used to calculate the PBS for transverse electric (TE) and transverse magnetic (TM) polarizations. At constant temperature, we find that if the hydrostatic pressure increases, the PBS for both polarizations shifts to higher energies without modifying the gap width. On removing a triangular hole from the structure, both gap position and width remain unchanged for TM polarizations with the presence of a defective band whose energy is tuned to pressure increases.