Tracing terahertz plasmon polaritons with a tunable-by-design dispersion in topological insulator metaelements.

ABSTRACT: Collective oscillations of massless charge carriers in two-dimensional materials-Dirac plasmon polaritons (DPPs)-are of paramount importance for engineering nanophotonic devices with tunable optical response. However, tailoring the optical properties of DPPs in a nanomaterial is a very challenging task, particularly at terahertz (THz) frequencies, where the DPP momentum is more than one order of magnitude larger than that of the free-space photons, and DDP attenuation is high. Here, we conceive and demonstrate a strategy to tune the DPP dispersion in topological insulator metamaterials. We engineer laterally coupled linear metaelements, fabricated from epitaxial Bi2Se3, with selected coupling distances with the purpose to tune their wavevector, by geometry. We launch and directly map the p

SUBMITTER: Viti L 

PROVIDER: S-EPMC12381016 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature