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Absorptive and refractive nonlinearity of carbon nanotubes grown on Si substrate

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Abstract

The third-order susceptibility of multiwalled carbon nanotubes (MWCNTs) grown on Si substrate were measured using reflective Z-scan (RZ-scan) technique with femto-second laser pulses at 790 nm. The nonlinear absorption coefficient 'beta' and nonlinear refraction index 'gamma' were measured to be about 9*10^(2) cm/GW and 9.6*10^(-3) cm2/GW, respectively. This is about one order of magnitude larger than the measurement of MWCNTs on transparent quartz substrate. The enhanced optical nonlinearities are contributed by the enhanced local field and the photoinduced off-resonant absorption of the 'pi'-plamon of MWCNTs on Si.

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Daijian Chen:Department of Physics, Wuhan University, Wuhan 430072
Peng Liu:Department of Physics, Tsinghua University, Tsinghua-Foxconn Nanotechnology Research Center, Beijing 100084
Si Xiao:Department of Physics, Wuhan University, Wuhan 430072
Sha Ding:Department of Physics, Wuhan University, Wuhan 430072
Ququan Wang:Department of Physics, Wuhan University, Wuhan 430072Center of Nanoscience and Nanotechnology Research, Wuhan University, Wuhan 430072

备注:Q. Wang is the author to whom the correspondence should be addressed, his e-mail address is qqwang@whu.edu.cn

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引用该论文

Daijian Chen, Peng Liu, Si Xiao, Sha Ding, Ququan Wang, "Absorptive and refractive nonlinearity of carbon nanotubes grown on Si substrate," Chinese Optics Letters 3(0s), 213-215 (2005)

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