Three Dimensional FDTD Analysis of Near-field Optical Disk

摘要

Scattering characteristics of a near-field optical disk with a bow-tie shaped metallic nano-aperture were investigated. In the analysis, finite-difference time-domain (FDTD) method into which motion equations of free electrons are installed were used and a three dimensional disk structure was considered. Electromagnetic field distributions of optical near-field around the aperture and far-field scattering patterns from the phase change were analyzed.