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Optical and electronic characteristics of single walled carbon nanotubes and silicon nanoclusters by tetrahertz spectroscopy

Altan, Hakan
Huang, F
Federici, JF
Lan, AD
Grebel, H
We have conducted visible pump-THz (THz-terahertz) probe measurements on single wall carbon nanotubes deposited on quartz substrates. Our results suggest that the photoexcited nanotubes exhibit localized transport due to Lorentz-type photoinduced localized states from 0.2 to 0.7 THz. Upon modeling the THz transmission through the photoexcited layer with an effective dielectric constant given by Maxwell-Garnett theory we found that the data are best fit by a broad Lorentz state at 0.5 THz. These experiments were repeated for ion-implanted, 3-4 nm Si nanoclusters in quartz for which a similar behavior was observed. (C) 2004 American Institute of Physics.