18 November 2008 Photonic crystal properties of opal-hematite and opal-magnetite films
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Proceedings Volume 7138, Photonics, Devices, and Systems IV; 713816 (2008) https://doi.org/10.1117/12.818010
Event: Photonics, Devices, and Systems IV, 2008, Prague, Czech Republic
Abstract
Photonic crystal and structural properties of synthesized opal films filled with the iron oxides: hematite (α-Fe2O3) and magnetite (Fe3O4) were investigated by means of scanning electron microscopy, X-ray diffraction, and Fourier transforme spectroscopy. Hematite was infiltrated into opal film pores without depositing the oxide onto the outer film surface by the method of lateral infiltration under capillary forces from a liquid precursor. The synthesis of Fe3O4 was performed in the opal pores using α→Fe2O3 as a precursor. The evolution of Bragg diffraction line from the (111) planes of the f.c.c lattice of the opal-α-Fe2O3 film with a various filling degree was studied. The maximum filling degrees both of opal- α-Fe2O3 and of opal-Fe3O4 films, estimated from the reflection spectra, appeared to be similar and equal to ~ 55% of the pore volume. The reversible chemical transformation of fillers in opal pores α-Fe2O3→Fe3O4→α-Fe2O3 changes only the filler dielectric constant but does not practically produce structural defects that could affect the photonic crystal properties of the composite.
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S. A. Grudinkin, S. F. Kaplan, N. F. Kartenko, D. A. Kurdyukov, V. G. Golubev, "Photonic crystal properties of opal-hematite and opal-magnetite films", Proc. SPIE 7138, Photonics, Devices, and Systems IV, 713816 (18 November 2008); doi: 10.1117/12.818010; https://doi.org/10.1117/12.818010
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