Alternating layers of air and photonic crystal with 360-nm airholes. The negative refractive index of the material cancels that of the air and can be used to collimate a light beam.
From the article:
Self-Collimation of Light over Millimeter-Scale Distance in a Quasi-Zero-Average-Index MetamaterialV. Mocella, S. Cabrini, A. S. P. Chang, P. Dardano, L. Moretti, I. Rendina, D. Olynick, B. Harteneck, and S. Dhuey
Phys. Rev. Lett. 102, 133902 (2009)
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