Nonlinear Plasmonic Sensing
Nonlinear Plasmonic Sensing
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DOI：
10.1021/acs.nanolett.6b00478
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发表时间：
2016-05-01
期刊：
影响因子：
10.8
通讯作者：
Giessen, Harald
中科院分区：
文献类型：
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作者：
Mesch, Martin;Metzger, Bernd;Giessen, Harald
我们引入了非线性等离子体传感的概念，依靠简单等离子体纳米天线产生的三次谐波。由于非线性转换过程，我们观察到与常用的线性局域表面等离子体共振传感相比，对折射率局部变化的灵敏度更高。折射率的变化可以小到10（-3）。为了确定灵敏度最高的光谱位置，我们对等离子体纳米天线阵列进行了线性和三次谐波光谱分析，这是我们传感器的基本组成部分。此外，同时检测线性和非线性信号允许对两种方法进行定量比较，从而进一步了解我们传感器的工作原理。虽然信噪比是相当的，但非线性传感给出的相对信号变化约为7倍。
We introduce the concept of nonlinear plasmonic sensing, relying on third harmonic generation from simple plasmonic nanoantennas. Because of the nonlinear conversion process we observe a larger sensitivity to a local change in the refractive index as compared to the commonly used linear localized surface plasmon resonance sensing. Refractive index changes as small as 10(-3) can be detected. In order to determine the spectral position of highest sensitivity, we perform linear and third harmonic spectroscopy on plasmonic nanoantenna arrays, which are the fundamental building blocks of our sensor. Furthermore, simultaneous detection of linear and nonlinear signals allows quantitative comparison of both methods, providing further insight into the working principle of our sensor. While the signal-to-noise ratio is comparable, nonlinear sensing gives about seven times higher relative signal changes.