Photonic band-gap for a rectangular array of metallic rods
The effects of electromagnetic distribution into layers made out of periodic metallic rods are studied numerically by the finite difference time domain approach (FDTD). Incident waves with TE and TM polarization are considered in their effect through the periodic structure. The transmitted Poynting vector spectra and its photonic band-gap are shown.
Abstract We investigate non-reciprocal wave propagation in spatiotemporal phononic plates. Specifically, the first aim of this manuscript is to propose a general formulation of the Plane Wave Expansion Method (PWEM) that, in contrast with previous works, is applicable to any class of 2D spatiotemporal unit cells whose properties can be expanded in traveling plane waves. The second aim is to exploit this analysis tool in order to study a class of phononic materials capable of violating mirror symmetry in reciprocal space, therefore breaking reciprocity principle along different propagation directions in physical space. This is obtained by considering the plate elastic properties to be discretely modulated in space and continuously in time. Theoretical dispersion profiles are validated and compared with numerical simulations.