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

Ogawa, T.; Watanabe, S.; Minami, N.; Shimano, R.
July 2010
Applied Physics Letters;7/26/2010, Vol. 97 Issue 4, p041111
Academic Journal
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.


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