We investigated readout characteristics of a near-field optical disk with an acuteedged metallic nano-aperture. We analyzed electromagnetic field distributions of optical near-field around the aperture and calculated far-field scattering pattern from the phase change disk by means of FDTD method. We showed that field intensity of near-field light can be increased by adjusting edge angles of the aperture. We also investigated the influence of the edge angles on output through the recorded marks.
展开▼
