Fig. 4. (Color online) Ensemble extinction spectra of (a) 3.71, (b) 3.95, (c) 4.19, and (d) 4.65 aspect ratio (AR) of GNRs. Solid lines indicate experimental spectra, dashed red and green lines correspond to the probe and pump wavelengths of 635 and 808 nm, respectively. AR distributions of GNRs are (e) 3.71, (f) 3.95, (g) 4.19, and (h) 4.65. Insets are representative transmission electron microscopy images. The distributions are presented in panels (e)–(h), with the numbers of GNRs, AR means, and standard deviations indicated.
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