Fig. 3From: Observation of single-molecule Raman spectroscopy enabled by synergic electromagnetic and chemical enhancementExperimental characterization of WS2 chemical enhancement and Au plasmonic nanogap electromagnetic enhancement for RhB Raman scattering. From top to bottom panels show the WS2 enhanced (brown, red, orange and green lines) Raman spectra, Au nanogap enhanced Raman spectra (yellow line) and normal Raman spectra of RhB (blue line)Back to article page