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Opt Lett. 2011 Apr 1;36(7):1074-6. doi: 10.1364/OL.36.001074.

Near-field observation of beam steering in a photonic crystal superprism.

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Groupe d'Optique de Champ Proche, Laboratoire Interdisciplinaire Carnot de Bourgogne, CNRS, 9 Avenue A. Savary, 21078 Dijon, France.


The optical near-field technique is applied to provide a direct experimental observation of the refracted beam propagation inside a photonic crystal structure displaying a superprism effect. The obtained results show a 35° light beam angle deviation for a wavelength variation from 1500 to 1600 nm. The experimentally determined beam divergence is in good agreement with modeling predictions and previously performed transmittance experiments. A marked self-collimation propagation over a broad 20 nm wide spectral range centered at λ=1550 nm is experimentally demonstrated. The developed technique opens promising perspectives for the invisibility cloaking structures investigation.

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