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首页> 外文期刊>Nano letters >Nonlinear Optical Imaging of Individual Carbon Nanotubes with Four-Wave-Mixing Microscopy
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Nonlinear Optical Imaging of Individual Carbon Nanotubes with Four-Wave-Mixing Microscopy

机译：单个碳纳米管的四波混频显微镜的非线性光学成像。

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摘要

Dual color four-wave-mixing (FWM) microscopy is used to spatially resolve the third-order optical response from individual carbon nanotubes. Good signal-to-noise is obtained from single-walled carbon nanotubes (SWNT) sifting on substrates, when the excitation beams are resonant with electronic transitions of the nanotube, by detecting the FWM response at the anti-Stokes frequency. Whereas the coherent anti-Stokes (CAS) signal is sensitive to both electronic and vibrational resonances of the material, it is shown that the signal from individual SWNTs is dominated by the electronic response. The CAS signal is strongly polarization dependent, with the highest signals found parallel with the enhanced electronic polarizibility along the long axis of the SWNT.
机译：双色四波混合（FWM）显微镜用于空间解析来自单个碳纳米管的三阶光学响应。当激发光束与纳米管的电子跃迁共振时，通过检测反斯托克斯频率下的FWM响应，可以在基板上筛分单壁碳纳米管（SWNT）获得良好的信噪比。相干反斯托克斯（CAS）信号对材料的电子共振和振动共振均敏感，但表明来自单个SWNT的信号受电子响应支配。 CAS信号强烈依赖于极化，发现最高信号与沿着SWNT长轴增强的电子极化率平行。

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