Table of Contents
ISRN Optics
Volume 2013, Article ID 543960, 6 pages
Research Article

Numerical Analysis of Ridged-Circular Nanoaperture for Near-Field Optical Disk

Faculty of Engineering Science, Kansai University, Suita, Osaka 564-8680, Japan

Received 22 August 2013; Accepted 19 September 2013

Academic Editors: J. M. Gonzalez-Leal and L. Kassab

Copyright © 2013 Toshiaki Kitamura. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A ridged-circular nanoaperture is investigated through three-dimensional (finite-difference time-domain) FDTD method. The motion equations of free electrons are inserted to analyze a metallic material. The electromagnetic field distributions of optical near-field around the aperture are investigated. The phase change disk illuminated by a near-field optical light through a ridged-circular nanoaperture is also analyzed. The far-field scattering patterns from the phase change disk and the crosstalk characteristics between plural marks are studied.