Optical Metasurfaces – planarized patterned devices with thickness smaller than or comparable to the operational wavelength – can engineer the light wavefront beyond the limitations of natural materials, and they offer novel opportunities for optical technologies. I will discuss our recent efforts in the design, optimization, fabrication and characterization of dielectric and metallic metasurfaces enabling different nonlinear functionalities, such as nonreciprocal wave propagation, power limiters, efficient SHG generation, and beam steering. I will discuss the main potential and challenges of current approaches and provide an outlook on possible future directions.
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