Figure 1.

Polaritonic chemistry as a multiscale problem. (a) The challenges in modeling polaritonic chemistry in photonic cavities involve the description of large ensemble of molecules collectively coupled, all embedded in a complex chemical environment. (b) The challenges in achieving a detailed description in plasmonic nanocavities involve the accurate modeling of the plasmonic inhomogeneous electromagnetic field to be interfaced with an accurate quantum-chemical treatment of (relatively few) molecules.