Three-dimensional photonic bandgap crystals of titania hollow spheres at visible wavelengths |
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Authors: | Yongzheng Zhu Yanling Cao Juan Ding Zhihui Li Junsong Liu Yuanbin Chi |
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Affiliation: | (1) Department of Mathematics and Physics, Dalian Jiaotong University, Dalian, 116028, China;(2) National Laboratory of Superhard Materials, Jilin University, Changchun, 130012, China |
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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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Keywords: | KeywordHeading" >PACS 42.70.Qs 68.55.-a 81.05.-t 81.05.Zx 82.70.Dd |
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