Effects of pressure and rotation on photonic crystal slabs composed by triangular holes arranged in a hexagonal lattice

In this work, we use the Guided-Mode Expansion method to calculate the photonic band structure in a photonic crystal slab composed by triangular air holes arranged in a hexagonal lattice. Furthermore, this study focuses on the dependence of the dielectric function of the slab on hydrostatic pressure. The results reveal that when pressure increases, the photonic band structure shifts to higher energies at constant temperatures and constant triangle side lengths. In addition, the width of the TE-like photonic band gap also increases as pressure increases. An increase in band gap width when comparing the photonic band gap for the lattice with unrotated holes against that with rotated holes is observed.