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The ability to manipulate the electric-field vector of broadband terahertzwaves is essential for applications of terahertz technologies in many areas,and can open up new possibilities for nonlinear terahertz spectroscopy andcoherent control. Here, we propose a novel laser-driven terahertz emitter,consisting of metasurface-patterned magnetic multilayer heterostructures. Suchhybrid terahertz emitters can combine the advantages of spintronic emitters forbeing ultrabroadband, efficient and flexible, as well as those of metasurfacesfor the unique capability to manipulate terahertz waves with high precision anddegree of freedom. Taking a stripe-patterned metasurface as an example, wedemonstrate the generation of broadband terahertz waves with tunable chirality.Based on experimental and theoretical studies, the interplay between thelaser-induced spintronic-origin currents and the metasurface-induced transientcharges/currents are investigated, revealing the strong influence on the devicefunctionality originated from both the light-matter interactions in individualmetasurface units and the dynamic coupling between them. Our work not onlyoffers a flexible, reliable and cost-effective solution for chiral terahertzwave generation and manipulation, but also opens a new pathway tometasurface-tailored spintronic devices for efficient vector-control ofelectromagnetic waves in the terahertz regime.

Active spintronic-metasurface terahertz emitters with tunable chirality