Theory of light reflection and transmission by a plasmonic nanocomposite slab: emergence of broadband perfect absorption

A theory of light reflection and transmission by an optically thin nanocomposite slab that contains randomly distributed metal nanoparticles (NPs) is developed. The underlying model treats NPs as point dipoles employs a dyadic Green’s function known analytically for allows one to obtain the refection coefficients in fully analytical form. also takes into account enhanced decay localized surface plasmons dense NP arrays scattering at roughness. It demonstrated first effect leads broadband perfect absorption observed such nanocomposites, whereas second responsible its omnidirectional character polarization insensitivity. These findings open up new possibilities engineer plasmonic nanocomposites.