The manipulation of photons via artificially introduced line and point defects in photonic crystals is becoming important for various scientific and engineering applications. Here, we propose a concept for realizing high extraction of the photons from a line-defect waveguide to free space through a point-defect cavity in a photonic crystal. A configuration of heterophotonic crystals with different lattice constants is introduced, and the heterostructure interface plays an important role, acting as a nearly perfect but selective mirror for photons of a specific energy. Furthermore, the enhancement of extraction efficiency is experimentally demonstrated in the fabricated device.
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Song et al. (2005) studied this question.
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