LAUSR

A new scheme of Raman scattering of a laser by THz graphene plasmons in the presence of both space charge and electromagnetic surface plasmons is proposed. Plasmon–laser coupling arises through the two dimensional response of electrons in graphene. For optical frequency laser scattering by THz plasmons, phase matching conditions are satisfied for near normal incidence and the Raman scattered wave also propagates normal to the graphene surface. The amplitude of the electric field of the Raman scattered wave scales linearly with the plasmon density fluctuation level and laser amplitude and inversely with the electron effective mass. Raman scattering would provide in situ diagnostics of the amplitude and frequency of the THz wave.