Transparency induced in opals via nanometer thick conformal coating

Guoliang Shang, Kaline P. Furlan, Robert Zierold, Robert Blick, Rolf Janßen, Alexander Petrov & Manfred Eich
Self-assembled periodic structures out of monodisperse spherical particles, so-called opals, are a versatile approach to obtain 3D photonic crystals. We show that a thin conformal coating of only several nanometers can completely alter the reflection properties of such an opal. Specifically, a coating with a refractive index larger than that of the spherical particles can eliminate the first photonic band gap of opals. To explain this non-intuitive effect, where a nm-scaled coating results in a...
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