Plasmonic Band Structure Controls Single-Molecule Fluorescence
Plasmonic Band Structure Controls Single-Molecule Fluorescence
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DOI：
10.1021/nn4033008
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发表时间：
2013-10-01
期刊：
影响因子：
17.1
通讯作者：
Koenderink, A. Femius
中科院分区：
文献类型：
--
作者：
Langguth, Lutz;Punj, Deep;Koenderink, A. Femius
等离子体激元和光子晶体是两种互补的方法来定制单发射体荧光，一方面使用金属附近的强局部场增强，另一方面使用空间扩展的光子带结构效应。在这里，我们探讨了自发辐射控制的出现，由有限大小的六边形阵列的纳米孔铣在金膜。我们证明，已经小的晶格，使高度定向和增强发射从单个荧光分子在中心孔。即使对于只有四个单元格的集群，方向性也是由等离子体晶体能带结构决定的，这一点已经被全波数值模拟所证实。这种由单个量子发射器驱动的等离子体相位阵列天线的实现打开了一个灵活的工具箱来设计荧光及其检测。
Plasmonics and photonic crystals are two complementary approaches to tailor single-emitter fluorescence, using strong local field enhancements near metals on one hand and spatially extended photonic band structure effects on the other hand. Here, we explore the emergence of spontaneous emission control by finite-sized hexagonal arrays of nanoapertures milled in gold film. We demonstrate that already small lattices enable highly directional and enhanced emission from single fluorescent molecules in the central aperture. Even for clusters just four unit cells across, the directionality is set by the plasmonic crystal band structure, as confirmed by full-wave numerical simulations. This realization of plasmonic phase array antennas driven by single quantum emitters opens a flexible toolbox to engineer fluorescence and its detection.