inverse opal

Accurate calculation of the local density of optical states in inverse-opal photonic crystals
I. S. Nikolaev, W. L. Vos, and A. F. Koenderink
J. Opt. Soc. Am. B 26, 987-997 (2009)

Enhanced backscattering from photonic crystals
A. F. Koenderink, M. Megens, G. van Soest, W. L. Vos, and A. Lagendijk
Phys. Lett. A 268, 104-111 (2000)

Preparation of photonic crystals made of air spheres in titania
J. E. G. J. Wijnhoven and W. L. Vos
Science 281, 802-804 (1998)