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In nanoscale photonic devices, the demand for multifunctionality frommetasurface 2D optics increases rapidly. To explore fine-tuning in the designmetric, we reinvestigated the trapezoid shape copper metasurface withFinite-Difference Time-Domain simulation for efficiently using linearlypolarized light for two different functionalities. From the plasmonic bandstructure, we see how the degree of asymmetry in geometry affects the efficientresonance coupling of the traveling plasmonic modes, along with different typesof mode hybridization profiles related to the nanoantenna's geometric shape.Tuning the nanoantenna's length, we can excite the effective plasmon modesupported by this configuration and guide out surface wave unidirectionallyfrom the normal incident free-space light for visible to infrared range.Directed surface plasmon polariton has both antisymmetric and symmetric modesoscillating between the top and bottom surface of the continuous metal layerdepending on the nanoantenna's length and wavelength. This proposed Coppermetasurface is optimized for far-field application of broadband (600-900 nm)anomalous beam steering for an average of 65 percent efficiency with a maximumof 64 degree angle. This work brings more understanding of how one metasurfacecan be implemented in small footprint plasmonic devices, waveguide modecontrolling, as well as beam steering with their wavelength dependentfunctionality.

Coupled plasmon wave dynamics beyond anomalous reflection: phase gradient Copper metasurface for visible to the near infrared spectrum