Preparation of Photonic Crystals Made of Air Spheres in Titania

Three-dimensional crystals of air spheres in titania (TiO$_2$) with radii between 120 and 1000 nanometers were made by filling the voids in artificial opals by precipitation from a liquid-phase chemical reaction and subsequently removing the original opal material by calcination. These macroporous m...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1998-08, Vol.281 (5378), p.802-804
Main Authors: Judith E. G. J. Wijnhoven, Vos, Willem L.
Format: Article
Language:English
Subjects:
Anatase
Chemistry
Crystal lattices
Crystals
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Materials
Opal
Optical materials
Optical reflection
Optics
Photonic bandgap materials
Photonics
Physics
Porous materials
Radius of a sphere
Self-organizing systems
Spectral reflectance
Titanium dioxide
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Summary:Three-dimensional crystals of air spheres in titania (TiO$_2$) with radii between 120 and 1000 nanometers were made by filling the voids in artificial opals by precipitation from a liquid-phase chemical reaction and subsequently removing the original opal material by calcination. These macroporous materials are a new class of photonic band gap crystals for the optical spectrum. Scanning electron microscopy, Raman spectroscopy, and optical microscopy confirm the quality of the samples, and optical reflectivity demonstrates that the crystals are strongly photonic and near that needed to exhibit band gap behavior.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.281.5378.802