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All‐optical structure assignment of individual single‐walled carbon nanotubes from Rayleigh and Raman scattering measurements
Author(s) -
Berciaud Stéphane,
Deshpande Vikram V.,
Caldwell Robert,
Miyauchi Yuhei,
Voisin Christophe,
Kim Philip,
Hone James,
Heinz Tony F.
Publication year - 2012
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201200152
Subject(s) - rayleigh scattering , raman spectroscopy , carbon nanotube , materials science , raman scattering , molecular physics , rayleigh length , spectral line , symmetry (geometry) , optics , nanotechnology , physics , laser , geometry , mathematics , quantum mechanics , laser beams
We present an all‐optical method for structure assignment of individual single‐walled carbon nanotubes (SWNTs) based on combined measurements of the elastically (Rayleigh) and inelastically (Raman) scattered light by individual freestanding specimens. The optical resonances of a single SWNT are identified from the Rayleigh spectra. These measurements are complemented with an independent estimation of the SWNT diameter and chiral angle from its radial breathing and G Raman modes, respectively. An assignment of the ( n , m ) chiral indices can thus be provided. In the most simple cases, a reliable structure assignment can be inferred from the Rayleigh spectra alone. However, we also show that SWNTs with different structures may display similar Rayleigh spectra within a given photon energy window. In these situations, Raman measurements provide unambiguous criteria for a proper structure assignment. This approach is particularly helpful in order to identify the high‐symmetry armchair and zig‐zag structures.