Terahertz absorption spectra of high purity metallic and semiconducting single-walled carbon nanotube thin films

摘要

Absorption spectra of high purity metallic and semiconducting single-walled carbon nanotubes separated by density-gradient ultracentrifugation method have been measured using THz time-domain spectroscopy. Absorbance in metallic nanotubes increase with increasing frequency up to 6THz. This result suggests that the dielectronic properties even for high purity metallic nanotube samples can not be explained by simple Drude conduciton model.