Graphene-Based Metasurfaces for Efficient Third Harmonic Generation

Graphene’s exceptional properties as a tunable and nonlinear 2D photonic material combined with the capability to support tightly-confined surface plasmons in the technologically attractive THz regime, make graphene a unique nonlinear material for THz applications [1] . The short wavelength of propagating graphene plasmons enables the design of metasurfaces (MSs) supporting higher-order resonances, while the lattice constant remains subwavelength even for higher harmonic frequencies, avoiding diffraction effects.