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We report the observation of a large-angle self-collimation phenomenonoccurring in photonic crystals composed of nanorods. Electromagnetic wavesincident onto such photonic crystals from directions covering a wide-range ofincident angles become highly localized along a single array of rods, whichresults in narrow-beam propagation without divergence. A propagation length of0.4 mm is experimentally observed over the wavelength range of 1540 nm to 1570nm, even in the large incident angle case, which is a very considerable lengthscale for on-chip optical interconnection.

Millimeter-scale and large-angle self-collimation in a photonic crystal composed of silicon nanorods