High efficient optical focusing of a zone plate composed of metal/dielectric multilayer.
We numerically investigate the optical field enhancement by a metal/dielectric multilayered zone plate. The optical field enhancement at the focal point of a zone plate originates not only from surface plasmon polaritons (SPPs)-assisted diffraction process along the propagation direction of incident light, but also from multiple scattering and coupling of surface plasmons (SPs) along the metal/dielectric multilayer films. By comparing multilayered zone plates to a conventional monolayered zone plate, we present the effects associated with the number of building blocks and different dielectric materials in the building block on the efficiency of the transmission.
Kim
Hyun Chul
HC
Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX 77843-3128,USA. khc99@tamu.edu
Ko
Hyungduk
H
Cheng
Mosong
M