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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 6 THz. This result suggests that the dielectronic properties even for high purity metallic nanotube samples can not be explained...
Summary form only given. Because of their small nanometer size and strong electronic confinement, quantum dots exhibit zero-dimensional electronic and optical effects which continue to be interesting for physics and promising for applications. To study single and clusters of self-organized semiconductor quantum dots, near-field optical nanoprobing is a powerful tool. Its spatial resolution surpasses...
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