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Sunil Kumar, Natrajan Kamaraju, Alexander Moravsky, R. O. Loutfy, Marc Tondusson, Eric Freysz and Ajay Kumar Sood Terahertz Time Domain Spectroscopy to Detect Low-Frequency Vibrations of Double-Walled Carbon Nanotubes European Journal of Inorganic Chemistry 2010

Article first published online: 16 AUG 2010 | DOI: 10.1002/ejic.201000524

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We experimentally observed two low-frequency phonon modes at 0.45 and 0.75 THz for a free-standing double-walled carbon nanotube film of thickness 200 nm by using terahertz time domain spectroscopy. The complex dielectric function was measured in the range 0.1–2.5 THz. The film cuts the amplitude of the THz pulse by almost 50 % without affecting its temporal width, suggesting a possible application as neutral density filter in the THz spectral range.

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