  Raman scattering signal can be enhanced through localization of incident
field into sub-wavelength hot-spots through plasmonic nano-structures
(Surface-enhanced Raman scattering-SERS). Recently, further enhancement of SERS
signal via quantum objects are proposed by [1] without increasing the hot-spot
intensity (\textit{silent-enhancement}) where this suggestion prevents the
modification of vibrational modes or the breakdown of molecules. The method
utilizes path interference in the non-linear response of Stokes-shifted Raman
modes. In this work, we extend this phenomenon to tune the spectral position of
\textit{silent-enhancement} factor where the multiple vibrational modes can be
detected with a better signal-to-noise ratio, simultaneously. This can be
achieved in two different schemes by employing either (i) graphene structures
with quantum emitters or (ii) replacing quantum emitters with graphene
spherical nano-shell in \cite{Postaci2018}. In addition, the latter system is
exactly solvable in the steady-state. These suggestions not only preserve
conventional non-linear Raman processes but also provide flexibility to enhance
(silently) multiple vibrational Raman modes due to the tunable optical
properties of graphene.
