Complete photonic bandgaps in supercell photonic crystals

Abstract

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 $n_{high}/n_{low}=2.1$, 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.

arXiv comment5 pages, 4 figures

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Cited by in corpus (5)

• Observation of a higher-order topological bound state in the continuum
• Point-Defect-Localized Bound States in the Continuum in Photonic Crystals and Structured Fibers
• 10 dB emission suppression in a structured low index medium
• New geometric receipts for design of photonic crystals and metamaterials: optimal toric packings
• The limits for complete photonic bandgaps in low-contrast media