Mid-infrared Fourier-transform spectroscopy with a high-brilliance tunable laser source: investigating sample areas down to 5 μm diameter.
Mid-infrared Fourier-transform spectroscopy with a high-brilliance tunable laser source: investigating sample areas down to 5 μm diameter.
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具有高亮度可调谐激光源的中红外傅里叶变换光谱：研究直径小至 5 μm 的样品区域。
DOI：
10.1364/oe.23.011105
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发表时间：
2015
期刊：
影响因子：
3.8
通讯作者：
H. Giessen
中科院分区：
文献类型：
--
作者：
T. Steinle;F. Neubrech;A. Steinmann;Xinghui Yin;H. Giessen
我们展示了高灵敏度的红外光谱的样品量接近衍射极限耦合飞秒光纤反馈光学参量振荡器（OPO）到传统的傅里叶变换红外（FTIR）光谱仪。高亮度和长期稳定的红外辐射，1e（2）带宽高达125 nm，很容易在1.4 μm和4.2 μm之间以43 MHz的重复频率调谐，从而实现快速和低噪声的红外光谱。我们通过测量3 μm范围内的典型分子振动来证明这一点。结合表面增强红外光谱，其中共振激发的金属纳米粒子的受限电磁近场被用来增强分子振动，我们实现了十八烷乙烷分子单层的光谱检测。与传统光源和同步辐射相比，我们紧凑的台式OPO系统具有显著改进的性能，非常适合生命科学和医学实验室中微量分子种类的快速分析。
We demonstrate highly sensitive infrared spectroscopy of sample volumes close to the diffraction limit by coupling a femtosecond fiber-feedback optical parametric oscillator (OPO) to a conventional Fourier-transform infrared (FTIR) spectrometer. The high brilliance and long-term stable infrared radiation with 1e(2)-bandwidths up to 125 nm is easily tunable between 1.4 μm and 4.2 μm at 43 MHz repetition rate and thus enables rapid and low-noise infrared spectroscopy. We demonstrate this by measuring typical molecular vibrations in the range of 3 μm. Combined with surface-enhanced infrared spectroscopy, where the confined electromagnetic near-fields of resonantly excited metal nanoparticles are employed to enhance molecular vibrations, we realize the spectroscopic detection of a molecular monolayer of octadecanethiol. In comparison to conventional light sources and synchrotron radiation, our compact table-top OPO system features a significantly improved performance making it highly suitable for rapid analysis of minute amounts of molecular species in life science and medicine laboratories.
影响因子：
4
作者：
van Helden, J. H.;Lang, N.;Roepcke, J.
通讯作者：
Roepcke, J.