Department of Physics, The University of Tokyo, Tokyo, 113-0033, Japan.
Aeronautical Technology Directorate, Japan Aerospace Exploration Agency, Tokyo, 181-0015, Japan.
Nat Commun. 2019 Sep 27;10(1):4411. doi: 10.1038/s41467-019-12442-9.
Vibrational spectroscopy, comprised of infrared absorption and Raman scattering spectroscopy, is widely used for label-free optical sensing and imaging in various scientific and industrial fields. The two molecular spectroscopy methods are sensitive to different types of vibrations and provide complementary vibrational spectra, but obtaining complete vibrational information with a single spectroscopic device is challenging due to the large wavelength discrepancy between the two methods. Here, we demonstrate simultaneous infrared absorption and Raman scattering spectroscopy that allows us to measure the complete broadband vibrational spectra in the molecular fingerprint region with a single instrument based on an ultrashort pulsed laser. The system is based on dual-modal Fourier-transform spectroscopy enabled by efficient use of nonlinear optical effects. Our proof-of-concept experiment demonstrates rapid, broadband and high spectral resolution measurements of complementary spectra of organic liquids for precise and accurate molecular analysis.
振动光谱学包括红外吸收光谱学和拉曼散射光谱学，广泛应用于各个科学和工业领域的无标记光学传感和成像。这两种分子光谱方法对不同类型的振动敏感，并提供互补的振动光谱，但由于两种方法的波长差异很大，因此很难用单个光谱仪获得完整的振动信息。在这里，我们展示了同时进行的红外吸收和拉曼散射光谱学，允许我们基于超短脉冲激光的单个仪器测量分子指纹区域的完整宽带振动光谱。该系统基于双模态傅里叶变换光谱学，通过有效利用非线性光学效应实现。我们的概念验证实验演示了快速、宽带和高光谱分辨率测量有机液体的互补光谱，用于精确和准确的分子分析。
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