Excitonic imaging spectroscopy of single-walled carbon nanotubes

We show how photoluminescence (PL) imaging can be used to gain fundamental spectroscopic information on the optical excitations in single-walled carbon nanotubes (SWNTs). Individual SWNTs are identified, and emission and excitation (PLE) spectra are obtained. In addition to the dominant E l i and Ej 2 transitions, we observe several resonances including the transverse Ej 2 exciton, and up to three excited excitonic bands. The (n,m) family dependence is obtained for some 25 species in the 1.1 to 1.6 pm emission range. We provide simple power series expansion to facilitate (n,in) assignment of all these peaks. This paper complements recently published work.