Abstract
AbstractPropagation of electromagnetic waves in spatially confined three‐dimensional (3D) photonic crystals (PhCs) of high dielectric contrast is studied for the case when the regime of the multiple Bragg diffraction (MBD) is of importance. The Bragg reflection spectra of opal‐like PhCs made up of polystyrene spheres are measured. Detailed comparison of the eigenmode energy spectrum with the measured and calculated reflectance contours is performed. The complicated structure of the Bragg reflection spectra is shown to be due to the additional eigenmodes excited resonantly by diffraction of light from the crystal planes inclined to the lateral ones.
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