Resonant excitation of terahertz surface plasmons by optical rectification over rippled graphene surface, deposited on \(\text {SiO}_{2}\) using a mode conversion of amplitude modulated p-polarized laser beam. A pump surface plasmons exert a ponderomotive force on the free electrons of the graphene surface and impart a linear oscillatory velocity at the modulation frequency. The current density develops by coupling the linear oscillatory velocity with modulated electron density and resonantly excites the terahertz surface plasmons at the modulation frequency. The amplitude of terahertz surface plasmons can be tunable by Fermi energy of graphene surface \(\text {E}_\text {F}\) . There is a possibility that the current study will be used to utilize THz detectors and sensors.
