Transmissão e reflexão de feixes eletromagnéticos por um material em camadas com simetria PT

Abstract

We study the transmission and reflection properties of monochromatic plane waves and monochromatic Gaussian beams interacting with a three-layer isotropic dielectric structure having paritytime symmetry. By using the angular spectrum of plane waves, we obtain the transmittance T and reflectance R of the material and observe its dependence on the beam waist of the incident beam, the width of the layers and the gain/loss parameter of the active materials. We demonstrate that, in contrast to the scattering problem involving single plane waves, the transmittance and reflectance strongly depend on the beam size. Finally, we observe that the Gaussian beam at some limit in its waist recovers the results of the plane wave model.