Details of samples fabrication method and experimental measurement procedures. Detailed characterization and indexation of all 4 individual DWNTs, based on ED, HRTEM, Rayleigh and Raman spectroscopies. PL spectra of (7,6)@(16,6) DWNT measured at 693 nm (1.79 eV) and 700 nm (1.77 eV) and plotted as a function of Raman shift (with 2G+2D Raman peak indicated in the figure). PL spectra of (14,1)@(15,12) DWNT. Raman spectra of individual SC@M (14,1)@(15,12) DWNT, measured at 776 nm (1.60 eV), 850 nm (1.46 eV) and 457 nm (2.71 eV), showing electronic Raman peaks. Resonant Raman excitation map and resonant Raman excitation profiles of (14,1)@(15,12) DWNT in the G-modes range.

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