Plasmonic Nanoantennas for Multispectral Surface-Enhanced Spectroscopies
Plasmonic Nanoantennas for Multispectral Surface-Enhanced Spectroscopies
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DOI：
10.1021/jp404535x
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发表时间：
2013-09-12
影响因子：
3.7
通讯作者：
Maier, Stefan A.
中科院分区：
文献类型：
--
作者：
Aouani, Heykel;Rahmani, Mohsen;Maier, Stefan A.
等离子体纳米天线为通过荧光、拉曼和红外吸收光谱有效地检测、分析和监测单个生物分子提供了新的途径。然而，用于多光谱光谱的高效生物传感器的发展仍然受到等离子体器件窄带响应的限制，因为它们通常被设计为在特定带宽下工作，与所研究的目标生物分子的吸收、散射或发射频率相匹配。因此，从可见光到红外频率系统地进行生物传感需要设计和制造多个等离子体纳米天线配置，并且阻碍了用于随机化学物质多光谱探测的纳米级集成传感器的发展。在这里，我们建议通过使用宽带对数周期纳米天线来克服这些限制，该纳米天线设计用于从可见光到中红外波长区域产生显着的电磁强度增强。我们展示了在单纳米天线上功能化的生物分子的同时表面增强荧光、拉曼和红外吸收光谱，这为在同一芯片上开发适合多光谱生物传感的集成器件开辟了新的机会。
Plasmonic nanoantennas provide new routes for efficiently detecting, analyzing, and monitoring single biomolecules via fluorescence, Raman, and infrared absorption spectroscopies. The development of efficient biosensors for multispectral spectroscopy remains nevertheless limited by the narrowband responses of plasmonic devices, as they are generally designed to operate in a specific bandwidth, matching with the absorption, scattering, or emission frequency of target biomolecules under investigation. Therefore, performing biosensing from visible to infrared frequencies systematically requires designing and fabricating multiple plasmonic nanoantenna configurations and prevents the development of nanoscale integrated sensors for multispectral probing of random chemical species. Here, we propose to overcome these limitations by using broadband log-periodic nanoantennas designed to generate significant electromagnetic intensity enhancements from the visible to the mid-IR wavelength regions. We demonstrate simultaneous surface-enhanced fluorescence, Raman, and infrared absorption spectroscopies for biomolecules functionalized on top of single nanoantennas, which opens new opportunities for the development of integrated devices suitable for multispectral biosensing on the same chip.