Optical analogue of Bormmann effect for the photonic crystals
DOI:
https://doi.org/10.24144/2415-8038.2009.24.22-31Keywords:
Bormmann effect, Photonic crystals, Reflection and absorption spectraAbstract
We introduce a new optical effect in photonic crystals (PCs) - a direct analogue of the Borrmann effect being observed for conventional crystals in X-ray spectroscopy. Photonic crystal having a FCC opal-like structure with two-layered metal-dielectric balls placed in the nodes is considered. Using computer simulation by the layered Korringa–Kohn–Rostoker method (LKKR) dependence the PC absorption coefficient dependence on wavelength and incidence angle is obtained. A wavelength region where the absorption changes sharply at minor variations of the incidence angle is found. The distribution of the spatial energy of an electromagnetic wave inside each layer of the PC for two angles of incidence 23o и 30o corresponding to the minimum and the maximum of the absorption coefficient at the wavelength 455 nm is analyzed using the finite-difference time-domain (FDTD) method. It is shown that in the absorption maximum, sharp maxima of the energy of the electromagnetic field are localized near the surface of absorbing metal cores. Furthermore in the absorption minimum, the maxima of the energy distribution of the electromagnetic field are localized basically between the nodes of PC lattice. This effect can be considered as a direct analogue of the Borrmann effect in X-ray spectroscopy.
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