Metasurface-enhanced mid-infrared spectroscopy in the liquid phase.

Metasurface-enhanced mid-infrared spectroscopy in the liquid phase.
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液相中的超表面增强中红外光谱。

DOI:
10.1039/d2sc03927c
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发表时间:
2022-11-09
期刊:
影响因子:
8.4
通讯作者:
--
中科院分区:
化学1区
文献类型:
--
作者:

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振动光谱学是化学和生物分析中的重要工具。将振动光谱应用于稀释液体样品时的一个关键问题是由短相互作用长度和小消光系数以及低目标分子浓度引起的固有低灵敏度。在这里,我们介绍了一种新型的表面增强红外吸收光谱的基础上的共振的电介质超颖表面。我们证明,该方法是适合于探测振动带的光谱线宽范围内的稀释分析物。我们观察到,吸收信号增强了1-2个数量级,并表明这种增强导致检测的下限相比,衰减全反射(ATR)。总的来说,这项技术为光谱学家的工具包提供了一个重要的补充,特别是用于探测稀释样品。一种新的表面增强红外吸收(SEIRA)光谱方法利用介电超颖表面的共振,在微尺度深度提供强场增强,使其适用于分析稀液体样品。
Vibrational spectroscopy is an important tool in chemical and biological analysis. A key issue when applying vibrational spectroscopy to dilute liquid samples is the inherently low sensitivity caused by short interaction lengths and small extinction coefficients, combined with low target molecule concentrations. Here, we introduce a novel type of surface-enhanced infrared absorption spectroscopy based on the resonance of a dielectric metasurface. We demonstrate that the method is suitable for probing vibrational bands of dilute analytes with a range of spectral linewidths. We observe that the absorption signal is enhanced by 1–2 orders of magnitude and show that this enhancement leads to a lower limit of detection compared to attenuated total reflection (ATR). Overall, the technique provides an important addition to the spectroscopist's toolkit especially for probing dilute samples. A novel surface-enhanced infrared absorption (SEIRA) spectroscopy method exploits the resonance of a dielectric metasurface to provide strong field enhancement at a microscale depth, making it suitable for analysis of dilute liquid samples.
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