Beam Propagation in Photonic Crystals

Details Beam Propagation in Photonic Crystals Beam Propagation in Photonic Crystals

2006-11-23

arxiv.org/abs/cond-mat/0611606v1

Physics

Condensed Matter

Materials Science

submitted to PRE

Scientific paper

The recent interest in the imaging possibilities of photonic crystals (superlensing, superprism, optical mirages etc...) call for a detailed analysis of beam propagation inside a finite periodic structure. In this paper, we give such a theoretical and numerical analysis of beam propagation in 1D and 2D photonic crystals. We show that, contrarily to common knowledge, it is not always true that the direction of propagation of a beam is given by the normal to the dispersion curve. We explain this phenomenon in terms of evanescent waves and we construct a renormalized dispersion curve that gives the correct direction.

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