Figure 3.

(a–c) Angle- and polarization-dependent photoluminescence spectra of samples with pitch 670, 830, and 1000 nm (intensity is multiplied 10 times in (c) for regions beyond 1280 nm for clarity), respectively. Analytical dependencies for corresponding Rayleigh anomalies at negative angles are marked with white dotted lines. (d) Normalized (to E₁₁ transition, top) and normalized differential (bottom) PL spectra of pure SWNTs (black) and TE-polarized emission normal to the sample surface with pitch 670, 830, and 1000 nm, TE and TM polarizations at ±15° for pitch 670 nm. (e) Angle dependence of normalized PL for TM-polarized emission for pitch 670 nm (at 1039 nm, green) compared to TE-polarized light at peak positions 1054 (red), 1259 (blue), and 1521 nm (purple) corresponding to the three samples with pitch 670, 830, and 1000 nm.