Polaritonic metasurfaces

Polaritons are half-wave half-matter particles that emerge in resonant materials strongly coupled to electromagnetic waves. Their responses can provide highly effective tools to engineer light at the nanoscale, enhance nonlinearities and unveil new wave phenomena. Of particular interest is the role that they can play in the context of metamaterials and metasurfaces, as polaritons can provide new knobs to enhance light-matter interactions, and at the same time engineered metastructures can provide new opportunities to engage polaritons and make them useful for applications. In this talk, I will discuss our recent progress in the area of polaritonic metasurfaces, with an emphasis on polaritonics and its role in advancing the field of metamaterials and metasurfaces. Tailored material resonances, based on plasmons, excitons, phonons and/or electronic transitions, can be strongly coupled to electromagnetic waves in engineered metasurfaces, unveiling new degrees of freedom for the control of light-matter interactions, paving the way towards technological advances.