Journal
OPTICS EXPRESS
Volume 22, Issue 22, Pages 27739-27749Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.027739
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- IBM Canada Research and Development Center
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This work describes a 3-D Finite-Difference Time-Domain (FDTD) computational approach for the optical characterization of an opal photonic crystal. To fully validate the approach we compare the computed transmittance of a crystal model with the transmittance of an actual crystal sample, as measured over the 400 divided by 750 nm wavelength range. The opal photonic crystal considered has a face-centered cubic (FCC) lattice structure of spherical particles made of polystyrene (a non-absorptive material with constant relative dielectric permittivity). Light-matter interaction is described by numerically solving Maxwell's equations via a parallelized FDTD code. Periodic boundary conditions (PBCs) at the outer edges of the crystal are used to effectively enforce an infinite lateral extension of the sample. A method to study the propagating Bloch modes inside the crystal bulk is also proposed, which allows the reconstruction of the omega-k dispersion curve for k sweeping discretely the Brillouin zone of the crystal. (C) 2014 Optical Society of America
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