Comment on “Large Optical Nonlinearity of Semiconducting Single-Walled Carbon Nanotubes under Resonant Excitations”

A Comment on the Letter by A. Maeda et al., Phys. Rev. Lett. 94, 047404 (2005). The authors of the Letter offer a Reply.

Figure 1

$\Delta T(t)$ response of an HiPco SWNT film measured with degenerate (a) and nondegenerate PP beams, having parallel ($\Delta T_{\mathrm{pa}}$) and perpendicular ($\Delta T_{\mathrm{pe}}$) polarizations, respectively. The polarization memory, $\rho (t)$, and the coherent artifact term, $\beta (t)$, extracted from the parallel and perpendicular responses using Eq. (1) are also shown.