期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 122, 期 21, 页码 11475-11481出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.8b03148
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资金
- Ministere de l'Enseignement Superieur et de la Recherche
- Conseil Regional Champagne-Ardenne
- Fonds Europeen de Developpement Regional (FEDER) fund
- Conseil General de l'Aube
- Cariplo Foundation through Project SHAPES [2013-0736]
It has been recently suggested that the nonlinear optical processes in plasmonic nanoantennas allow for a substantial boost in the sensitivity of plasmonic sensing platforms. Here, we present a sensing device based on an array of non-centrosymmetric plasmonic nanoantennas featuring enhanced second harmonic generation (SHG) integrated in a microfluidic chip. We evaluate its sensitivity both in the linear and nonlinear regime using a figure of merit (FOM = Delta I/I/Delta n) An that accounts for the relative change in the measured intensity, I, against the variation of the environmental refractive index n. While the signal-to-noise ratio achieved in both regimes allows attaining a resolution (i.e., minimum detectable refractive index variation) Delta n(min) approximate to 10(-3), the platform operation in the nonlinear regime features a sensitivity (i.e., the FOM) that is at least 3 times higher than the linear one. Thanks to the surface sensitivity of plasmon-enhanced development of such SHG sensing platforms with sensitivity performances exceeding those of their linear counterparts is within reach. SHG, our results show that the
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