Holographic THz Beam Generation by Nonlinear Plasmonic Metasurface Emitters

The advancement ofterahertz (THz) technology hinges on the progressmade in the development of efficient sources capable of generatingand shaping the THz emission. However, the currently available THzsources provide limited control over the generated field. Here, weuse near-field interactions in nonlinear Pancharatnam-Berryphase plasmonic metasurfaces to achieve deep subwavelength, precise,and continuous control over the local amplitude of the emitted field.We show that this new ability can be used for holographic THz beamgeneration. Specifically, we demonstrate the generation of preciselyshaped Hermite-Gauss, Top-Hat, and triangular beams.We show that using this method, higher-order modes are completelysuppressed, indicating optimal nonlinear diffraction efficiency. Inaddition, we demonstrate the application of the generated structuredbeams for obtaining enhanced imaging resolution and contrast. Thesedemonstrations hold immense potential to address challenges associatedwith a broad range of new applications employing THz technology.

Automated summary

The development of efficient sources for generating and shaping terahertz (THz) emission is crucial for the advancement of THz technology. This study demonstrates the use of near-field interactions in nonlinear Pancharatnam-Berry phase plasmonic metasurfaces to achieve precise and continuous control over the local amplitude of the emitted field, allowing for the generation of precisely shaped THz beams. The ability to generate structured beams holds immense potential for enhancing imaging resolution and contrast in THz technology applications.