Hiramatsu Kotaro, Kano Hideaki, Nagata Takashi
Department of Chemistry, School of Science, The University of Tokyo, Bunkyo-ku, Tokyo, Japan.
Opt Express. 2013 Jun 3;21(11):13515-21. doi: 10.1364/OE.21.013515.
We demonstrate a method to measure Raman optical activity (ROA) by using coherent anti-Stokes Raman scattering (CARS) spectral interferometry. An extremely weak chirality-induced CARS field is amplified through the interference with a strong CARS field generated from an external reference and is extracted by the Fourier transformation. In this interferometric coherent Raman optical activity (iCROA), both the sign and the magnitude of optical active non-resonant background susceptibility can be directly determined. Measurement of a CARS-ROA spectrum with less artifact is obtained because a broad offset artifact due to optical rotatory dispersion is clearly distinguished in iCROA.
我们展示了一种通过使用相干反斯托克斯拉曼散射（CARS）光谱干涉术来测量拉曼光学活性（ROA）的方法。一个极其微弱的手性诱导CARS场通过与外部参考产生的强CARS场干涉而被放大，并通过傅里叶变换提取出来。在这种干涉式相干拉曼光学活性（iCROA）中，可以直接确定光学活性非共振背景磁化率的符号和大小。由于在iCROA中可以清楚地分辨出由于旋光色散引起的宽偏移伪像，因此获得了具有较少伪像的CARS-ROA光谱测量结果。
