Dielectric resonators and metasurfaces

The properties of metasurfaces hold great promise for a large number of applications. Optical metasurfaces are flat arrangements of dielectric or metallic nanostructures, which allow tailoring the light propagation in a layer of subwavelength thickness. Thus, it is possible to control the phase and polarization of light, with applications such as flat lenses, holograms, or classical and quantum sensors.

We investigate optical properties of both ordered and disordered metasurfaces. Our focus is on sensing applications using metallic or dielectric nanoantennas as building blocks. While metallic nanonantennas can yield strong local near fields, dielectric resonators provide electric and magnetic resonances in spectral proximity, which allows for tuning the near- and far-field properties in unprecedent ways.