Doubly resonant photonic crystal cavities in gallium nitride for fluorescence sensing

N. A. Hueting, M. J. Cryan*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

5 Citations (Scopus)

Abstract

This paper presents the modeling and design of a photonic crystal (PhC) cavity in gallium nitride on sapphire. Using the 3D finite difference time domain method, we explore the suitability of asymmetric dielectric layer structures as a platform for L3 PhC cavities. The paper explores the origin of losses and modification to the cavity modes introduced by asymmetric layers. Based upon this analysis, a cavity design is proposed, which is optimized to provide enhancement for fluorescent molecule detection. A central air hole in the cavity allows the positioning of molecules in a high field region. Also, the hole modifies the cavity modes to have a smaller mode volume. Both of these properties are used to simultaneously enhance the absorption and spontaneous emission of fluorescent molecules.

Original languageEnglish
Pages (from-to)3008-3017
Number of pages10
JournalJournal of the Optical Society of America B
Volume31
Issue number12
DOIs
Publication statusPublished - 1 Dec 2014

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