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Optical response of single‐wall carbon nanotube sheets in the far‐infrared spectral range from 1 THz to 40 THz
Author(s) -
Kampfrath Tobias,
Perfetti Luca,
von Volkmann Konrad,
Aguirre Carla M.,
Desjardins Patrick,
Martel Richard,
Frischkorn Christian,
Wolf Martin
Publication year - 2007
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200776112
Subject(s) - terahertz radiation , carbon nanotube , drude model , materials science , infrared , far infrared , dielectric , lorentz transformation , dielectric function , resonance (particle physics) , spectroscopy , range (aeronautics) , condensed matter physics , physics , optics , optoelectronics , nanotechnology , atomic physics , quantum mechanics , composite material
Abstract The optical properties of single‐wall carbon nanotube sheets in the far‐infrared have been investigated with THz time‐domain spectroscopy. Over a wide frequency range from 1 THz to 40 THz, the complex dielectric function of the nanotube sample has been derived. Our data can be excellently reproduced by a Drude–Lorentz model function. The extracted fit parameters such as Lorentz resonance frequency and plasma frequency are consistent with values obtained by scanning tunneling techniques. We discuss the origin of both the Lorentz and Drude contribution in terms of direct and indirect optical transitions. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)