Hybrid nanoparticle-microcavity-based plasmonic nanosensors with improved detection resolution and extended remote-sensing ability.
Hybrid nanoparticle-microcavity-based plasmonic nanosensors with improved detection resolution and extended remote-sensing ability.
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DOI：
10.1038/ncomms2109
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发表时间：
2012
影响因子：
16.6
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中科院分区：
文献类型：
--
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基于等离子体纳米粒子的光学纳米传感器在化学和生物传感方面具有巨大的应用潜力，但其光谱检测分辨率受到其宽谐振线宽的严重限制，其空间传感深度仅限于几十纳米。在这里，我们展示了将单个金属纳米粒子的强偶极等离子体共振与光学微腔的窄带宽共振相耦合，创建了混合模式并离散了宽局域共振，将传感优值提高了36倍。这种腔体-纳米粒子系统有效地结合了法布里-珀罗微谐振器和等离子体纳米粒子的优点，提供了一些有趣的特征，如遥感能力、与入射角无关的共振、强烈的偏振相关性、横向超小传感体积和极大地提高了检测分辨率。这种混合系统不仅可以用于局部监测生物传感中的特定动态过程，还可以远程检测薄膜纳米计量学中的重要薄膜参数。等离子体纳米粒子是有用的光学传感器，但其光谱分辨率受到等离子体共振线宽的阻碍。施密特等人。研究发现，将这种共振耦合到微腔可以产生具有增强的传感品质因数和更高的频率分辨率的混合模式。
Optical nanosensors based on plasmonic nanoparticles have great potential for chemical and biological sensing applications, but their spectral detection resolution is severely constrained by their broad resonance linewidth, and their spatial sensing depth is limited to several tens of nanometres. Here we demonstrate that coupling a strong dipolar plasmonic resonance of a single metallic nanoparticle to the narrow bandwidth resonances of an optical microcavity creates a hybrid mode and discretizes the broad localized resonance, boosting the sensing figure-of-merit by up to 36 times. This cavity–nanoparticle system effectively combines the advantages of Fabry–Perot microresonators with those of plasmonic nanoparticles, providing interesting features such as remote-sensing ability, incident-angle independent resonances, strong polarization dependence, lateral ultra small sensing volume and strongly improved detection resolution. Such a hybrid system can be used not only to locally monitor specific dynamic processes in biosensing, but also to remotely sense important film parameters in thin-film nanometrology. Plasmonic nanoparticles are useful as optical sensors, but their spectral resolution is hindered by the linewidth of the plasmon resonance. Schmidt et al. find that coupling this resonance to a microcavity creates hybrid modes with enhanced sensing figure-of-merit and improved frequency resolution.
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影响因子：
3.2
作者：
DOORMANN, V;KRUMME, JP;LENZ, H
通讯作者：
LENZ, H
影响因子：
56.9
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作者：
ATHERTON, PD;REAY, NK;HICKS, TR
通讯作者：
HICKS, TR