A method of forming one or more protrusions on an outer surface of a polished face of a solid state material, said method including the step of applying focused inert gas ion beam local irradiation towards an outer surface of a polished facet of a solid state material in a way of protruding top surface material; wherein irradiated focused inert gas ions from said focused inert gas ion bean penetrate the outer surface of said polished facet of said solid state material; and wherein irradiated focused inert gas ions cause expansive strain within the solid state crystal lattice of the solid state material below said outer surface at a pressure so as to induce expansion of solid state crystal lattice, and form a protrusion on the outer surface of the polished face of said solid state material.