Photonic crystal with triangular stack profile

The enhanced localized reflectivity at a plane where the refractive index derivatives are discontinuous is increased using a periodic triangular stack. This optical system is studied using three different methods: a slowly varying refractive index approximate solution, numerical solutions to the nonlinear amplitude equation and the exact analytical solution using a matrix formalism. The field intensity within a photonic crystal with a periodic triangular profile is evaluated as a function of penetration depth and wavelength. These results are compared with the standard binary layered structures. (C) 2015 Elsevier B.V. All rights reserved.