Doubly resonant photonic crystal cavities in gallium nitride for fluorescence sensing

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 l...

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Veröffentlicht in:Journal of the Optical Society of America. B, Optical physics Optical physics, 2014-12, Vol.31 (12), p.3008-3017
Hauptverfasser: Hueting, N. A., Cryan, M. J.
Format: Artikel
Sprache:eng
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Zusammenfassung: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.
ISSN:0740-3224
1520-8540
DOI:10.1364/JOSAB.31.003008