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 light beam angle deviation for a wavelength variation from 1500 to . 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 wide spectral range centered at is experimentally demonstrated. The developed technique opens promising perspectives for the invisibility cloaking structures investigation.
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