Investigation of tunable Dirac cones and flat bands in two dimensional plasma photonic crystals

We present finite difference time domain (FDTD) simulations of the response of a two-dimensional plasma photonic crystal to incident TE electromagnetic waves that span regions both above and below the plasma frequency, $\omega _{\mathrm{p\thinspace }}$and investigate the Dirac cone dispersion with double degeneracy near both $\Gamma $ and X symmetry points. Additionally, flat bands due to surface plasmon modes are investigated at frequencies below the plasma frequency. Experimentally, the transmission properties are characterized for a 7 by 7 2D plasma photonics crystal, with spatial E field mapping and transmission measurements completed on the test crystal.