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Harnessing Leaky Modes for Fluorescence Enhancement in Gold-Tipped Silicon Nanowires.
Journal of Physical Chemistry. C, Nanomaterials and Interfaces 2016 September 23
Hybrid structures containing plasmonic and photonic components can enhance light-matter interaction through both photonic and plasmonic modes and potentially their interactions. In this article, we systematically investigate the optical properties of nanoparticle-tipped silicon nanowires (NPTWs) and characterize their ability to enhance the fluorescence signal of two cyanine dyes (Cy3 and Cy5) selectively bound to the gold tip. Although both gold and silicon components contribute to the fluorescence signal enhancement, the experimentally observed strong morphology dependence of the fluorescence emission enhancement is demonstrated to depend on tunable leaky modes of the silicon nanowires. The ability to encode emission fluorescence enhancement in the structure of NPTWs is of high relevance for multiparametric biosensing and imaging.
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