Novel Dispersion-Adapted Photonic Crystal Cavity With Improved Disorder Stability

Karl Peter Welna, Simone Luca Portalupi, Matteo Galli, Liam O'Faolain, Thomas Fraser Krauss

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


We present a photonic crystal cavity (PhCC) design methodology that is based on systematically engineering the dispersion curve of a PhC line-defect. Our combined numerical and analytical approach offers the option of using a variety of different defect modifications to create a gentle-confinement cavity with a Gaussian profile. Here, we demonstrate the principle of the method by employing relatively large hole-shifts (tens of nanometers), aiming for improved stability against disorder. Such improved stability compared with the established heterostructure design approach is then experimentally confirmed on cavities fabricated in silicon. We point out some design features that are linked to this improved disorder stability. In addition, we note that different types of cavities exhibit dissimilar fabrication-limited Q-factors despite identical fabrication process.

Original languageEnglish
Pages (from-to)1177-1183
Number of pages7
JournalIEEE Journal of Quantum Electronics
Issue number9
Publication statusPublished - Sept 2012


  • disorder
  • Cavity
  • photonic crystal (PhC)
  • gentle-confinement


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