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 Ell and E-22 transitions, we observe several resonances including the transverse E-12 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 mu m emission range. We provide simple power series expansion to facilitate (n,m) assignment of all these peaks. This paper complements recently published work. [GRAPHICS] Photoluminescence image of SWNTs suspended over a patterned SiO2/Si substrate (image size 90x50 mu m(2)). (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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