A self-collimated beam propagating inside a planar photonic crystal is investigated. By measuring the beam divergence with distance a quantitative measure of the self-collimation effect is obtained. The beam width is measured using an experimental technique that maps the electromagnetic field inside the photonic crystal structure by measuring the out-of-plane scattering at the air holes. The experimental results agree well with theoretical predictions based on equifrequency surface analysis.
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Lombardet et al. (2006) studied this question.
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