Periodically arranged point defects in two-dimensional photonic crystals

We present and characterize point defects in a two-dimensional photonic crystal based on macroporous silicon. These point defects are prepatterned periodically, forming a superlattice within the photonic crystal. Spatially resolved optical investigations, related to morphological properties such as defect concentration and pore radius, are compared to ab initio band-structure calculations. The spatially confined defect states are identified and their interaction is evaluated quantitatively by applying a tight-binding model to describe the formation of bands.

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