Abstract
A non-close-packed three-dimensional photonic crystal of titania hollow spheres has been fabricated. The fabricated process is based on the silica template technique, thermal sintering, and the sol–gel process. The band-structure calculations and optical measurements both indicate that a quasi-full three-dimensional photonic bandgap located at the visible wavelength has been presented between the eighth and ninth bands. This indicates that the non-close-packed structure of titania hollow spheres was easier to open the complete photonic bandgaps than other face-centered cubic structures made by self-assembling methods at the visible region.
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Zhu, Y., Cao, Y., Ding, J. et al. Three-dimensional photonic bandgap crystals of titania hollow spheres at visible wavelengths. Appl. Phys. A 94, 731–734 (2009). https://doi.org/10.1007/s00339-009-5070-0
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DOI: https://doi.org/10.1007/s00339-009-5070-0