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Influence of Bloch wave decomposition on light coupling into planar photonic crystals is investigated using plane-wave-method and finite-difference time domain calculations. The contribution of each plane wave to the global Bloch wave energy is calculated to understand the relative power weights of fields excited in the patterned medium. It is shown that high coupling efficiency is obtained when plane-wave components excited through a direct parallel wave vector, i.e., without an additional lattice-induced translated parallel wave vector, bring an important amount of the overall Bloch propagating wave power.
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Cassan et al. (2007) studied this question.
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