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Diffractionless propagation of light in a low-index photonic-crystal film
: Iliew, R.; Etrich, C.; Peschel, U.; Lederer, F.; Augustin, M.; Fuchs, H.-J.; Schelle, D.; Kley, E.-B.; Nolte, S.; Tünnermann, A.
We experimentally demonstrate diffractionless propagation of light over 12 diffraction lengths in a two-dimensional photonic crystal film made of silicon nitride (SiNx). We show that self-guided beams may propagate for transverse electric (TE) and transverse magnetic (TM) polarized light but at slightly different frequencies. Three-dimensional calculations are used to optimize the structure for low loss and narrow beam operation in this low-index photonic crystals. Experimental and theoretical results are in good agreement.