| a Slices from the hyperspectral data show the transmission images ROI∥ROI∥ of an (18,16) SW-CNT at different excitation wavelengths with a 35 nm interval. bRepresentative spectra of the SW-CNT acquired from ROI∥ROI∥ and ROI⊥ROI⊥, respectively, by accumulating the spectra from 20 points along the SW-CNT. The reference spectrum is taken from the same sample with the same probe. c True-color images of the SW-CNT, constructed by converting the hyperspectral images into the RGB (red, green, and blue) channels using the CIE 1931 color matching functions. Scale bar: 50 nm. Pixel step: 3.33 nm (horizontal) and 10 nm (vertical). d Six adjacent near-field spectra across the SW-CNT along the black arrow in c, collected from ROI∥ROI∥ (left panel) and ROI⊥ROI⊥ (right panel), respectively. The scanning step is 3.3 nm per pixel. The integration time is 0.3 s per spectrum. The total light intensity delivered by the probe is roughly 30 nW. Images courtesy of Nature Communications / UCR. |
