Abstract

Atomic-layer-deposited iridium is coated onto three-dimensional tungsten woodpile photonic crystals to modify the optical properties of the structure. As the lattice constant of a metallic photonic bandgap structure decreases to the scale of the near-IR wavelengths, the band edge becomes pinned and cannot be pushed to shorter wavelengths because of limitations inherent in the material. With a thin coating of iridium, the band edge of a pinned tungsten lattice is pushed from $\sim 1.6\mu \mathrm{m}$ to below $1\mu \mathrm{m}$. This shift in the reflectance band edge will be accompanied by a reduction in the absorptance of the structure in the $1–2\mu \mathrm{m}$ range.

© 2009 Optical Society of America

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