Semiconductor Carbon Nanotubes as Ultrafast Switching Materials for Optical Telecommunications


  • We thank Sakakibara and Tokumoto at the National Institute of Advanced Industrial Science and Technology and Professors Kataura and Achiba at Tokyo Metropolitan University for giving us the opportunity to engage in this study. This work was supported by the New Energy and Industrial Technology Development Organization (NEDO) within the framework of the Femtosecond Technology Project.


The third-order nonlinear optical property χ(3)I of a film of single-walled carbon nanotubes was studied in the infrared region. The film combines a high χ(3)I (–0.85 × 10–7 esu at resonant wavelength) with a rapid transmittance recovery (from differential transmission spectra, see Figure), making it suitable for highly efficient and ultrafast devices for optical telecommunications.