Strong light-matter coupling using arrays of nanoantennas

Metallic nanostructures have increasingly been applied as a platform for exploring the physics of strong-light matter coupling, through their ability to confine light leading to large local fields. Recent attention along this theme has been focused on molecular systems at room temperature, resulting in several exciting observations arising from the hybridization of photonic modes both with excitons and phonons to form quasi-particles known as polaritons. In this contribution we focus on strong-coupling between molecules and the resonances supported by periodic arrays of nanoantennas. These planar arrays define open cavities, with a dual benefit of broad tuneability and unique dispersions, and we will highlight recent work regarding polariton lasing from these structures.