T-matrix method for calculation of second-harmonic generation in clusters of spherical particles

In this article, we present a T-matrix method for numerical computation of second-harmonic generation from clusters arbitrarily distributed spherical particles made centrosymmetric optical materials. The electromagnetic fields at the fundamental and (SH) frequencies are expanded in series vector wave functions, single sphere entries computed by imposing field boundary conditions surface particles. Different previous approaches, compute SH taking into account both local nonlocal bulk polarization sources, which allows one to accurately describe arbitrary Our can be used efficiently analyze various materials, including metallic, dielectric, semiconductor, polaritonic