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A Study on the Evaluation of the Optical Head of a Near-field Optical Recording System and Interference Pattern Analysis  

Yoon Hyoung Kil (한국과학기술원 기계공학과 NOM연구실)
Gweon Dae Gab (한국과학기술원 기계공학과)
Lee Jun Hee (한국과학기술원 기계공학과)
Jung Jae Hwa (한국과학기술원 기계공학과)
Oh Hyung Ryeol ((주)Hysonic, 한양대학교 안산캠퍼스 내)
Publication Information
Journal of the Korean Society for Precision Engineering / v.22, no.5, 2005 , pp. 80-86 More about this Journal
Abstract
Optical performance evaluation results and an interference fringe pattern analysis of alignment errors for an optical head of a near-field receding (NFR) system are presented. The focusing unit is an optical head of a NFR system and is composed of a solid immersion lens (SIL) and an objective lens (OL). Generally, the size of the focusing unit is smaller than that of the conventional optical recording head. Hence there are difficulties to assemble the small focusing unit precisely. We composed an evaluation system with an interferometer and evaluated some focusing unit samples aligned and assembled by manual and present the obtained results. Using the conventional optical tool, Code V, a tolerance analysis of the alignment error between the SIL and the objective lens and an interference pattern analysis for the assembly error are executed. Then, through an analysis of the simulation results, the conceptual auto-alignment methodology using a neural network approach is considered.
Keywords
interference pattern analysis; near-field recording; optical pick up head assembly; auto-alignment method;
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