Fig. 3: Nano-spectroscopy of different types of excitons.
From: Nano-spectroscopy of excitons in atomically thin transition metal dichalcogenides
a, b Normalized amplitude \({s}_{5}\left(\omega \right)/{s}_{5}(h-{{{{{\rm{BN}}}}}})\) and phase \({\varphi }_{5}\left(\omega \right)-{\varphi }_{5}\left(h-{{{{{\rm{BN}}}}}}\right)\) spectra for different sample regions (data points). The near-field data is fitted by the point dipole model and Lorentz oscillators (solid curves). The vertical dashed lines are used to mark the exciton energies of WSe2 and MoSe2 extracted from the point dipole model. The arrows in a mark peak energies of the PL spectra (Supplementary Fig. 4). c Near-field image of the amplitude \({s}_{5}\) taken at an excitation energy of 1.52 eV. HB: heterobilayer. d, e Near-field amplitude \({s}_{5}\) and phase \({\varphi }_{5}\) evolution along the line trace shown in (c). The horizontal dashed lines in d and e denote the exciton energies extracted from the point dipole model.
