Optical Propeties of Mesopyrmids Gorown on Si[100]

Mesopyramids are interesting polyhedron structures produced by annealing in vacuo Au thin films on Si(100) substrates. Two kinds of pyramids are produced by annealing. For fast quenching, super surface polyhedron structures are produced, which are referred to as mesopyramids. With controlled cool down, subsurface polyhedron mesostructures are produced, that are referred to as anti-mesopyramids. Because of their composition and morphology, these structures are simultaneously a surface plasmon polariton material and an optical element. The later property produces near and far field interference phenomena in reflection. The mesopyramids have a unique surface morphology consisting of channels and plateaus that produce polarized reflected light. The far field diffraction patterns of the mesopyramids and anti-mesopyramids are well modeled by a square aperture emitter. However, because of their differences in curvature (positive of negative), the diffraction patterns are either magnified or miniaturized. These unique structures have potential to advance the development of metalense optics.