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In this work a hybrid nanoplasmonic-Weyl Semimetal (WSM) structure isrealized for the first time utilizing silver nanopatch antennas and WSMTantalum Arsenide (TaAs). The studied hybrid WSM-nanoplasmonic structuredemonstrated a substantial, over x4.5 enhancement of the second harmonicgeneration (SHG) process compared to a bare TaAs film. To realize the hybridstructure while preserving TaAs properties, a scalable, non-destructivemanufacturing approach was developed that involves the fabrication of TaAsflakes from single crystalline TaAs, overgrowth of a silicon nitride overlayer,and drop-casting of silver nanopatch antennas. The strong polarization responseof both the bare flakes, along with the hybrid-nanoplasmonic cavitiesdemonstrates that this approach uniquely preserves the TaAs crystal structureand its optical response while providing significant enhancement of thenonlinear properties. The developed method allows leveraging the capabilitiesof plasmonics to control and enhance light-matter interactions at the nanometerscale to access and engineer WSM response. This work is the first step towardshigh-performance nanophotonic devices utilizing WSM topological properties.

Plasmonic Enhancement of Second Harmonic Generation in Weyl Semimetal TaAs