FDTD Analysis of a Near-Field Optical Disk with a Ridged-Square Nano-Aperture

Toshiaki KITAMURA  

IEICE TRANSACTIONS on Electronics   Vol.E95-C   No.6   pp.1110-1116
Publication Date: 2012/06/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E95.C.1110
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Storage Technology
near-field light,  nano-aperture,  optical disk,  scattering,  FDTD method,  

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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.