Resonant raman excitation profiles on individual carbon nanotubes of known absolute optical absorption spectra
Résumé
Recently, we determined using spatial modulation spectroscopy, over a broad optical spectral
range, the spectrum and amplitude of the absorption cross-section of individual semiconducting
single-wall carbon nanotubes.[1] Here, we will present resonant Raman excitation profiles (REP)
of radial breathing modes and G modes measured on the same SWNTs. The transition energies
and full width at half-maximum (FWHM) obtained using both measurements techniques will be
compared to discuss the different models commonly used to fit REP [2] as illustrated on Figure
1. Furthermore, interference effects on Raman intensity [3] will also be evidenced in the case of
two energetically close optical transitions. Finally, some recent results obtained on other systems
(SWNTs homogeneous dimer and double-walled carbon nanotubes) will be briefly reported.
[1] J.-C. Blancon et al., Nat. Comm. 4 (2013), 2542.
[2] C. Thomsen and S. Reich, M. Cardona, R. Merlin (Eds.): Light Scattering in Solid IX,Topics Appl. 3.
Physics 108 (2007), pp. 116-232.
[3] V. N. Popov and Ph. Lambin, Phys. Rev. B 73 (2006), 165425.