Abstract
We analyze the reflectivity spectra of synthetic opal crystals (sphere diameters of 200, 240, and 290 nm) infiltrated with ferroelectric sodium nitrite (NaNO2) after preannealing in air or argon. The reflectivity spectra of the opal samples show a band corresponding to the photonic band gap. Its position and shape strongly depend on the sphere diameter and annealing conditions. The spectra of the sodium-nitrite-infiltrated opal samples preannealed in air differ markedly from those of the samples preannealed in argon. The experimentally determined band gap position as a function of sphere diameter is compared to calculation results. Our data demonstrate that argon preannealing ensures effective infiltration of molten sodium nitrite into the pores of synthetic opal.
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