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

T. Ogawa, S. Watanabe, N. Minami, R. Shimano

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


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.

Original languageEnglish
Article number041111
JournalApplied Physics Letters
Issue number4
Publication statusPublished - 2010 Jul 26
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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