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首页> 外文期刊>Physica status solidi, B. Basic research >Single-beam pumped coherent anti-Stokes Raman scattering on carbon nanotubes
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Single-beam pumped coherent anti-Stokes Raman scattering on carbon nanotubes

机译：碳纳米管上的单束泵浦相干抗斯托克斯拉曼散射

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摘要

Giant optical fields locally generated in nanoscale metal structures through the local excitation of surface plasmons underlie a variety of nonlinear optical processes. Using silver and gold rough metallic films, reproducible enhancements of the Raman signal on various materials including carbon nano-tubes have been demonstrated. In addition, an abnormal anti-Stokes Raman emission, reminiscent of Coherent anti-Stokes Raman Scattering (CARS), is accurately observed on nano-metric thin films. We demonstrate that under a tight focusing of the excitation light, a CARS-type emission, resulting from a wave mixing process between the incident laser light and Stokes Raman light generated by a SERS mechanism, is produced. The results which corroborate the CARS emission are the following: a square relation between the CARS signal intensity and the film thickness; a square relationship between the CARS signal intensity and the exciting laser intensity; a dependence of the CARS intensity on the numerical aperture (NA) of the microscope objective used for the detection of the anti-Stokes signal; a polarization ratio in the anti-Stokes side always greater in comparison with that measured for an usual Stokes Raman signal. We demonstrate also that this mechanism may contribute to a clear identification of the state of the observed nanotubes, i.e. in isolated or bundled forms, even when tubes are in powders. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
机译：通过表面等离子体激元的局部激发在纳米级金属结构中局部产生的巨大光学场是各种非线性光学过程的基础。使用银和金的粗糙金属膜，已证明在包括碳纳米管在内的各种材料上可再现地增强了拉曼信号。另外，在纳米薄膜上可以精确地观察到异常的反斯托克斯拉曼发射，让人联想到相干反斯托克斯拉曼散射（CARS）。我们证明，在激发光的紧密聚焦下，会产生由入射激光和SERS机制产生的斯托克斯拉曼光之间的波混合过程引起的CARS型发射。证实CARS发射的结果如下：CARS信号强度与薄膜厚度之间的平方关系; CARS信号强度和激发激光强度之间的平方关系; CARS强度对用于检测反斯托克斯信号的显微镜物镜的数值孔径（NA）的依赖性;与通常的斯托克斯拉曼信号所测得的极化率相比，反斯托克斯侧的极化率总是更大。我们还证明了该机制可能有助于清楚地识别所观察到的纳米管的状态，即以分离或成束的形式，即使当管呈粉末状时也是如此。 （C）2008 WILEY-VCH Verlag GmbH＆Co.KGaA，Weinheim

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