Milliwatt terahertz harmonic generation from topological insulator metamaterials.

ABSTRACT: Achieving efficient, high-power harmonic generation in the terahertz spectral domain has technological applications, for example, in sixth generation (6G) communication networks. Massless Dirac fermions possess extremely large terahertz nonlinear susceptibilities and harmonic conversion efficiencies. However, the observed maximum generated harmonic power is limited, because of saturation effects at increasing incident powers, as shown recently for graphene. Here, we demonstrate room-temperature terahertz harmonic generation in a Bi₂Se₃ topological insulator and topological-insulator-grating metamaterial structures with surface-selective terahertz field enhancement. We obtain a third-harmonic power approaching the milliwatt range for an incident power of 75 mW-an impro

SUBMITTER: Tielrooij KJ 

PROVIDER: S-EPMC9622918 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature