  A classic harmonic oscillator model is developed to investigate the optical
properties of coupled metal nanoparticles (MNPs) with arbitrary configuration
in plane. The coupling coefficients are derived from classical electrodynamics.
Using this model, we can easily obtain the spectra of coupled MNPs varying with
the configurations of the system and the polarizations of external light.
Furthermore, the far field electric field distributions of different
configurations are revealed. This model is an extension of our previous works
which only discuss the parallel and vertical excitations for dimer. It is
useful to related applications
