Optical response of single-wall carbon nanotube sheets in the far-infrared spectral range from 1 THz to 40 THz

• Published in: Physica Status Solidi (b) Vol. 244; no. 11; pp. 3950 - 3954
• Main Authors: Kampfrath, Tobias, Perfetti, Luca, von Volkmann, Konrad, Aguirre, Carla M., Desjardins, Patrick, Martel, Richard, Frischkorn, Christian, Wolf, Martin
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Berlin WILEY-VCH Verlag 01.11.2007; WILEY‐VCH Verlag; Wiley
• Subjects: 73.63.Fg; 78.67.Ch; 81.07.De; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Nanotubes; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures; Physics; Dielectric function; Singlewalled nanotube; THz range; Lorentz law; Drude model; Resonance frequency; Optical properties; Tunnel effect; Optical transition; Carbon nanotubes; Plasmons; Infrared spectra
• ISSN: 0370-1972; 1521-3951
• DOI: 10.1002/pssb.200776112

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)