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SiO2 opal photonic crystals

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  • In this report, we presented the usage of Stober method to fabricate SiO2 nanospheres and self-assembly method to make SiO2 opal photonic crystals based on the fabricated SiO2 nanospheres. An averaged size of SiO2 nanospheres was controlled by varying concentrations of NH4OH and TEOS. Crystal structure and morphology of particles was investigated by using X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques.

    pdf6p nguaconbaynhay11 07-04-2021 3 0   Download

  • We present polarization- and angle-resolved optical reflection of a fine artificial opal photonic crystal consisting of SiO2 spheres into a face-centered-cubic lattice. The measurement shows the polarization dependence on high-order reflection (energy region a/λ = 1.0 – 1.5). It is shown that the reflection peaks are strongly dependent on s- and p-polarized light illuminating on the sample. The experiment results are analyzed and compared with photonic bands which are obtained according to prediction based on group theory.

    pdf8p thuyliebe 08-10-2018 21 0   Download

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