Microwave treated water soluble and amide functionalized single walled carbon nanotubes have been investigated using femtosecond degenerate pump-probe and nonlinear transmission experiments. The time resolved differential transmission using 75 femtosecond pulse with the central wavelength of 790 nm shows a bi-exponential ultrafast photo-bleaching with time constants of 160 fs (130 fs) and 920 fs (300 fs) for water soluble (amide functionalized) nanotubes. Open and closed aperture z-scans show saturation absorption and positive (negative) nonlinear refraction for water soluble (amide functionalized) nanotubes. Two photon absorption coefficient, beta(0) similar to 250 cm/GW (650 cm/GW) and nonlinear index, gamma similar to 15 cm(2)/pW (-30 cm(2)/pW) are obtained from the theoretical fit in the saturation limit to the data for two types of nanotubes.
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机译：已使用飞秒简并泵浦探针和非线性传输实验研究了微波处理的水溶性和酰胺官能化的单壁碳纳米管。使用75飞秒脉冲（中心波长为790 nm）的时间分辨差分传输显示了双指数超快光漂白，其水溶性（酰胺官能化）纳米管的时间常数分别为160 fs（130 fs）和920 fs（300 fs）。 。开孔和闭孔z扫描显示水溶性（酰胺官能化）纳米管的饱和吸收和正（负）非线性折射。从理论上可以获得两个类似于250 cm / GW（650 cm / GW）的光子吸收系数beta（0）和类似于15 cm（2）/ pW（-30 cm（2）/ pW）的非线性指数gamma使饱和度极限适合两种类型的纳米管的数据。
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