Band structure and optical properties of opal photonic crystals

Details Band structure and optical properties of opal photonic crystals Band structure and optical properties of opal photonic crystals

2005-05-03

arxiv.org/abs/cond-mat/0505068v1

Phys. Rev. B 72, 045102 (2005)

Physics

Condensed Matter

Other Condensed Matter

to appear in PRB

Scientific paper

10.1103/PhysRevB.72.045102

A theoretical approach for the interpretation of reflectance spectra of opal photonic crystals with fcc structure and (111) surface orientation is presented. It is based on the calculation of photonic bands and density of states corresponding to a specified angle of incidence in air. The results yield a clear distinction between diffraction in the direction of light propagation by (111) family planes (leading to the formation of a stop band) and diffraction in other directions by higher-order planes (corresponding to the excitation of photonic modes in the crystal). Reflectance measurements on artificial opals made of self-assembled polystyrene spheres are analyzed according to the theoretical scheme and give evidence of diffraction by higher-order crystalline planes in the photonic structure.

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