Optical properties and diffraction effects in opal photonic crystals
Year: 2006
Authors: Balestreri A., Andreani L.C., Agio M.
Autors Affiliation: Univ Pavia, Dipartimento Fis, I-27100 Pavia, Italy.
Abstract: Optical properties of fcc opals oriented along the [111] direction are calculated by means of a scattering-matrix approach based on approximating each sphere with cylindrical slices. The use of a plane-wave basis in each layer allows distinguishing zero-order reflection and transmission from higher-order (diffraction) spectra. Optical spectra at large values of the angle of incidence indicate the presence of diffraction effects and of polarization mixing along the LW orientation. Reflectance and transmittance in the high-energy region show a rich spectral dependence and compare reasonably well with recent experimental observations on polystyrene opals. Diffraction spectra as a function of the number of layers display an oscillatory behavior, pointing to the existence of a Pendellosung phenomenon, related to the exchange of energy between two propagating modes in the investigated three-dimensional photonic crystal. This phenomenon could be observed in transmittance experiments on high-quality opals with controlled thickness.
Journal/Review: PHYSICAL REVIEW E
Volume: 74 (3) Pages from: 36603-1 to: 36603-8
KeyWords: Colloidal Crystals; Band-gap; Transmission Coefficients; Bragg-diffraction; Wave Method; X-rays; Convergence; Dispersion; Scattering; DefectsDOI: 10.1103/PhysRevE.74.036603Citations: 51data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-11-17References taken from IsiWeb of Knowledge: (subscribers only)