MAGNETIC RESPONSE FROM A COMPOSITE OF METAL-DIELECTRIC PARTICLES IN THE VISIBLE RANGE: T-MATRIX SIMULATION

ABSTRACT. The optical response of a particle composed of a dielectric core surrounded by a densely packed shell of small metal spheres is simulated with the superposition T-matrix method for realistic material parameters. In order to compute the electric and mag-netic particle polarizabilities a single expansion T-matrix is derived from a particle centered T-matrix. Finally the permeability of a medium comprising such particles is found to de-viate considerable from unity resulting in a noticeable optical response. 1