First-order hyperpolarizabilities of chiral, polymer-wrapped single-walled carbon nanotubes.

We report the first-order hyperpolarizabilities (ßHRS values) of individualized, length-sorted (700 ± 50 nm long) (6,5) SWNTs and corresponding polymer-wrapped (6,5) SWNT superstructures. These SWNT-based nanohybrids feature semiconducting polymers that wrap the SWNT surface in an exclusive left-handed helical fashion. Manipulation of the polymer electronic structures in these well-defined nanoscale objects provides a new avenue to modulate the magnitude of ßHRS at long wavelength (1280 nm).