  In this article, non-classical properties of Raman modes are investigated.
The original goal, actually, is to identify how and by which method we can
induce non-classicality in Raman modes. We introduce a plasmonic system in
which Raman dye molecules are buried between two shells of the plasmonic
materials similar to onion-like core/shell nanoparticle. This system is excited
by the entangled photons, followed by analyzing its dynamics of motion using
the Heisenberg-Langevin equations by which the time evolution of the
signal-idler mode and Raman modes are derived. Interestingly, the entangled
photons are coupled to the plasmonic modes which are used to improve the
non-classicality. It is shown that the exciting system with the entangled
photons lead to inducing the non-classicality in Raman modes and entanglement
between them. This behavior is attributed to the non-classicality of input
modes that is coupled to the Raman modes considering the correlation between
the incident wave frequency and Raman modes frequency. Notably, these quantum
properties are dramatically affected by the environment temperature and Raman
molecules location around the plasmonic nanoparticles. Modelling results
demonstrate that a temperature increase has a drastic effect on system
dynamics. Moreover, it is found that the entanglement between modes in system
surely is affected by the coupling between the incident modes and plasmonic
modes generated by the core/shell nanoparticles. Finally, as an important
result, it is revealed that the Raman modes such as stoke and anti-stoke modes
show a revival behavior, which is a quantum phenomenon.
