One-dimensional carbon chains was predicted to have the largest Raman scattering cross section in any known substances (Tschannen C. D., et al. Nano Letters, 20, 6750−6755, 2020). Thus one can easily measure the anti-Stokes Raman of carbon chains at room temperature. Previously, we have conducted in-depth research on the anti-Stokes Raman spectroscopic study of a single carbon chain (Tschannen C. D., et al. ACS Nano, 15, 12249–12255, 2021).

    Recently, our collaborative study on the anti-Stokes Raman spectroscopy of single carbon chains was published in Nano Letters, reporting that the tip enhanced the Stokes and anti-Stokes Raman signal differently. Especially, the anti-Stokes Raman spectrum of the carbon chain can be enhanced more than 3000 times. In addition, the intensity ratio of the Stokes and anti-Stokes Raman spectra of the carbon chains is linearly correlated to the power of the laser and the ratio is increased by more than 20 under the tip enhancement compared to the far-field Raman, which is consistent with the theoretical calculation results of the Stokes and anti-Stokes effect introduced on the basis of Boltzmann theory.