Low index contrast heterostructure photonic crystal cavities with high quality factors and vertical radiation coupling

Xiaochen Ge, Momchil Minkov, Shanhui Fan, Xiuling Li, Weidong Zhou

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Abstract

We report here design and experimental demonstration of heterostructure photonic crystal cavities resonating near the Γ point with simultaneous strong lateral confinement and highly directional vertical radiation patterns. The lateral confinement is provided by a mode gap originating from a gradual modulation of the hole radii. High quality factor resonance is realized with a low index contrast between silicon nitride and quartz. The near surface-normal directional emission is preserved when the size of the core region is scaled down. The influence of the cavity size parameters on the resonant modes is also investigated theoretically and experimentally.

Original languageEnglish (US)
Article number141105
JournalApplied Physics Letters
Volume112
Issue number14
DOIs
StatePublished - Apr 2 2018

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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