Elimination of cracks in self-assembled photonic band gap crystals

Details Elimination of cracks in self-assembled photonic band gap crystals Elimination of cracks in self-assembled photonic band gap crystals

2003-12-16

arxiv.org/abs/cond-mat/0312403v1

Appl. Phys. Lett. 84, 3573 (2004).

Physics

Condensed Matter

Materials Science

REvTex: 4 pages, 3 figures

Scientific paper

10.1063/1.1737066

Thin colloidal crystals (or synthetic opals) composed of Stober silica spheres typically develop cracks when they are utilized to obtain photonic band gap crystals (or inverted opals). We find that by sintering the silica spheres prior to assembly of the opal these cracks can be avoided. We report the effects of temperature and duration of the heat treatment on 850 nm silica spheres using electron microscopy, thermogravimetry, and light scattering. We also find a large dependence of the refractive index of the silica on the temperature of the heat treatment. This may allow tuning of the refractive index of silica spheres.

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