Room temperature terahertz electro-optic modulation by excitons in carbon nanotubes

Room temperature terahertz electro-optic modulation by excitons in carbon nanotubes

We have investigated the electroabsorption of aligned micelle-wrapped single-walled carbon nanotubes induced by intense terahertz (THz) pulses by using THz-pump and optical-probe spectroscopy at room temperature. The electroabsorption signal is enhanced at exciton resonances near the optical communi...

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Bibliographic Details
Published in:Applied physics letters Vol. 97; no. 4
Main Authors: Ogawa, T., Watanabe, S., Minami, N., Shimano, R.
Format: Journal Article
Language:English
Published: 26-07-2010
Online Access:Get full text
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Summary:We have investigated the electroabsorption of aligned micelle-wrapped single-walled carbon nanotubes induced by intense terahertz (THz) pulses by using THz-pump and optical-probe spectroscopy at room temperature. The electroabsorption signal is enhanced at exciton resonances near the optical communication wavelength. The signal showed a quadratic dependence on the THz electric field and instantaneously followed the THz oscillation (∼1 ps). The observed ultrafast electro-optic modulation with a THz bandwidth suggests the potential functionality of carbon nanotubes in high-speed electro-optic devices.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3470105