@misc{9229752,
  abstract     = {{Metasurfaces are two-dimensional arrays of sub-wavelength structures often arranged in a periodic lattice. During recent years, metasurfaces have emerged as one of the most promising platforms to shape electromagnetic waves using compact devices, exhibiting extraordinary control over the light amplitude, polarization and phase. Starting with metallic materials, metasurface research has shifted toward dielectric-based devices to achieve low losses and enable control of light in the visible spectrum, with new functionalities emerging from complex resonant effects within the scatterers. Resonant metasurfaces provide a new platform to engineer the electromagnetic response, and the ease of fabrication allowed researchers to explore a variety of new designs over the years for many different applications, including harmonic generation. While some materials of choice have been identified for specific applications and spectral ranges, new approaches based on hybrid material compositions have been lacking and could offer new degrees of freedom for tuning the resonances without modifying the scatterers geometry. This thesis investigates the resonant response of all-dielectric metasurfaces composed of meta-atoms with a core-shell structure, in which a cylindrical pillar of one material is coated by a shell of a second material. The scattering and resonant response of single meta-atoms and metasurfaces having a core-shell geometry are studied using finite element simulations, investigating how the shell thickness, pillar diameter, height and periodicity affect the resonant behaviour of the devices. Two metasurfaces are fabricated using electron beam lithography and atomic layer deposition and are optically characterized using a white light source. In parallel, a metasurface concept optimised for third harmonic generation is designed to be placed inside a multicell pass to increase the efficiency of the nonlinear process.}},
  author       = {{Marzanati, Samuele}},
  language     = {{eng}},
  note         = {{Student Paper}},
  title        = {{Investigation of resonant effects in core-shell metasurface geometries and design concept of a metasurface for harmonic generation}},
  year         = {{2026}},
}