Metasurfaces for field manipulation and sensing

This paper summarizes some recent results on the design, fabrication and characterization of metasurfaces for field manipulation and sensing. First, we present the integration of a phase-gradient plasmonic metasurface on the tip of an optical fiber. As possible application examples, we illustrate the beam steering and the excitation of surface waves. This latter can find interesting applications in label-free optical sensing. Subsequently, we present the design of coding metasurfaces for diffuse scattering. More specifically, via a theoretical study of the relevant scaling-laws, we derive some absolute and realistic bounds on the scattering-cross-section reduction, and we introduce a simple, deterministic sub-optimal design strategy.