Properties of nonclassical correlated Stokes–anti-Stokes photon pair in decane

In this study, the correlated Stokes–anti-Stokes Raman scattering, denominated as the SaS process, is investigated in a decane sample, generalizing for a liquid the results observed in crystalline diamond. The production of SaS photon pairs is observed in both real and virtual processes by measuring nonclassical values of the second-order cross-correlation function $g_{\text{SaS}}^2\left(0\right)$. The correlated Raman spectrum is observed only for Raman shift values below approximately $2900{\mathrm{cm}}^{-1}$, which is equivalent to the highest vibrational mode of the decane molecule. Furthermore, despite the fact that decane is a liquid, the polarization and spatial profile of the SaS process in decane presents the same properties as those observed in diamond.