Abstract
A method of three-dimensional (3D) holography is used for the growth of photonic crystals of sub-micron cell parameters by gas decomposition in a 3D interference field of UV laser light. Either amorphous or crystalline chromium oxides are obtained by photolysis of chromyl chloride CrO 2 Cl 2 for different experimental conditions. The most interesting product is obtained for a photolysis of CrO 2 Cl 2 at low pressure, on a cooled TiO 2 single-crystal substrate and for a higher beam energy. The growth begins with the formation of epitaxial CrO 2 metastable phase which is partly transformed into Cr 2 O 3 under UV irradiation. Due to crystallographic orientational relationships between CrO 2 and Cr 2 O 3 , the growth of a well organized 3D photonic crystal of Cr 2 O 3 phase goes on according to the 3D periodic modulations of electromagnetic energy of the interference field. In the present case, the Cr 2 O 3 phase exhibits four sets of equivalent crystallographic orientations with respect to the single-crystal substrate. From such a result, one can expect to produce in a further work photonic crystals constituted of single-crystalline Cr 2 O 3 phase in epitaxy onto a Cr 2 O 3 or sapphire Al 2 O 3 substrate.
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