Compact photonic crystal disk cavity optimized using the gentle confinement method and boundary design

Jon Øyvind Kjellman, Takuo Tanemura, Yoshiaki Nakano

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

A compact, novel photonic crystal cavity aimed at applications with strict area limitations is presented. Optimization shows that the gentle confinement method previously used for line-defect cavities can be applied to more limited geometries. It also shows that it is paramount to consider the boundary region to minimize in-plane losses. The investigation show that a near optimum boundary thickness can be found by considering the boundary region as a Fabry-Pérot resonator. This optimization strategy is shown to be deterministic in terms of resonance wavelength. For an optimized air-clad, silicon cavity, finite-difference time-domain simulations give Q-values as high as 75,000 which is comparable to other photonic crystal cavities of similar size.

Original languageEnglish
Article number042001
JournalJapanese Journal of Applied Physics
Volume54
Issue number4
DOIs
Publication statusPublished - 1 Apr 2015

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