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FDTD Analysis of a Near-Field Optical Disk with a Ridged-Square Nano-Aperture
IEICE TRANSACTIONS on Electronics
Publication Date: 2012/06/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Storage Technology
near-field light, nano-aperture, optical disk, scattering, FDTD method,
Full Text: PDF(1.3MB)>>
The scattering from a phase change disk that is illuminated by an optical near field through a ridged-square nano-aperture was analyzed. A finite-difference time-domain (FDTD) method installed with motion equations of free electrons was used in the analysis and a three dimensional disk structure was taken into consideration. The far-field scattering patterns from the phase change disk were analyzed and the sum-signal output through a condenser lens was calculated. The crosstalk between plural marks and the readout characteristics of mark trains were investigated.