Artistic impression of the photonic crystal used to demonstrate sub-Bragg energy gaps below the first-order Bragg condition. The crystal consists of nanopores etched in silicon and arranged in a centered rectangular lattice. (Image by T.J. Huisman)

From the article:

Observation of Sub-Bragg Diffraction of Waves in Crystals
Simon R. Huisman, Rajesh V. Nair, Alex Hartsuiker, Léon A. Woldering, Allard P. Mosk, and Willem L. Vos
Phys. Rev. Lett. 108, 083901 (2012)

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