387 research outputs found
Complete photonic bandgaps in supercell photonic crystals
We develop a class of supercell photonic crystals supporting complete
photonic bandgaps based on breaking spatial symmetries of the underlying
primitive photonic crystal. One member of this class based on a two-dimensional
honeycomb structure supports a complete bandgap for an index-contrast ratio as
low as , making this the first such 2D photonic crystal
to support a complete bandgap in lossless materials at visible frequencies. The
complete bandgaps found in such supercell photonic crystals do not necessarily
monotonically increase as the index-contrast in the system is increased,
disproving a long-held conjecture of complete bandgaps in photonic crystals.Comment: 5 pages, 4 figure
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