FDTD法による光記録用光近接場ヘッドの電磁界分布の解析

概要

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In recent years, there has been a strong trend and movement towards digitalism and high memory capacity in the multi-media field including digital movies. It is expected that new kinds of high density data storage to match this environment will be developed. The optical disk system using near-field optics and technology is considered to be a strong candidate for ultra-high density optical memory. In order to realize a new optical recording system we have focused our research on the writing head with high optical efficiency and resolution. We evaluated the properties of pyramidal optical heads using FDTD (Finite Difference Time Domain) method and obtained data in order to find the best structure and design for new near-field optical heads. From our simulation results, we found that the output laser shows its best efficiency at the area of 100nm aperture in the case of total reflection prism-type head, where it has an optical resolution of 200nm in FWHM and a power density several times larger than that of the input laser. If the prism is coated with a metal layer, the aperture size of best efficiency can be decreased below 100nm, and thus, the recording density of our system can be reached at a few hundreds of Gb/in^2.
東海大学の論文
2001-03-30