Abstract
The authors report on the terahertz time-domain spectroscopy of single-walled carbon nanotubes (SWCNTs) dispersed in a polymer film in a broad frequency range from 0.2to20THz. The complex dielectric function of the composite film is obtained without using Kramers-Kronig analysis, from which the dielectric function of SWCNTs is extracted by using the effective medium theory. The real part of the dielectric function exhibits very large values at low frequency below 2THz. The conductivity spectrum shows a peak around 3THz. The spectral behavior is consistent with overdamped Lorentz oscillator model, indicating the response of curvature-induced small-gap SWCNTs.
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