Isotropic negative effective permeability in the visible range produced by clusters of plasmonic triangular nanoprisms

In this paper we suggest and study a design solution of metamaterial made of raspberry-like clusters of silver triangular nanoprisms. We show that this design theoretically allows one to obtain isotropic negative effective permeability in the visible range even taking into account real dissipative losses in silver. To estimate the magnetic response of the structure two independent methods are used. The study is presented in view of prospective for isotropic doubly-negative metamaterials operating in the visible range.

► A new design of metamaterial for artificial magnetism in the visible is proposed.
► Triangular nanoprisms allow isotropic negative permeability in the visible range.
► Two independent methods of extraction of magnetic polarizability are used.
► Real dissipative losses in silver are taken into account.
► A basis for future isotropic optical doubly-negative composites is presented.