• Lamb waves
• metasurfaces
• optical modulators
• optomechanics
• perturbation theory
• photonic-phononic crystal slabs
• surface acoustic waves

In this thesis, the static and dynamic optical behavior of nanostructured metasurfaces
is investigated, both theoretically and experimentally. Optomechanical simulations
have been performed by developing a quasi-normal mode perturbation
theory calculator based on the finite element method. They also show the unsuitability
of rigorous coupled wave analysis for the approximation of our system. On
the experimental side, we fully characterize the static optical response of the device,
also observing polarization rotation. Regarding the dynamic response, we demonstrate
gigahertz optomechanical modulation of the intensity of light in the telecom
wavelength band. This result opens up the way towards diverse applications, such as high-frequency amplitude, phase, and polarization compact modulators, and microwave photonics.