Doubly resonant photonic crystal cavities in gallium nitride for fluorescence sensing
Doubly resonant photonic crystal cavities in gallium nitride for fluorescence sensing
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DOI：
10.1364/josab.31.003008
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发表时间：
2014-12
影响因子：
1.9
通讯作者：
N. A. Hueting;M. Cryan
中科院分区：
文献类型：
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作者：
N. A. Hueting;M. Cryan
本文介绍了蓝宝石上氮化镓光子晶体(PHC)腔的建模和设计。利用三维时域有限差分方法，探讨了非对称介质层结构作为L3 PHC腔体平台的适用性。本文探讨了非对称层引入的腔模的损耗来源和修正方法。在此分析的基础上，提出了一种优化的腔体设计，为荧光分子检测提供了增强。腔体上的中央气孔允许分子在高场区域定位。此外，该孔修改了腔模式以具有更小的模式体积。这两种性质都被用来同时增强荧光分子的吸收和自发发射。
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.