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Theoretical and Numerical Lens Design Using Near Field Theory for High Density Storage Device  

이문도 (연세대학교 기계공학과)
박재혁 (연세대학교 기계공학과)
박노철 (연세대학교 기계공학과)
박영필 (연세대학교 기계공학부)
Publication Information
Journal of the Korean Society for Precision Engineering / v.20, no.9, 2003 , pp. 173-179 More about this Journal
Abstract
In optical storage device system, there are several research topics to increase its recording density. The main idea is reducing wave length of laser diode and magnifying the number of numerical aperture (NA). In conventional optical system NA cannot be over the unity in the air because of its diffraction limit. But it is possible to overcome its limitation of unity in near field using Solid Immersion Lens. In this work, the mathematical Solid Immersion Lens (SIL) design process was illustrated by using near field theory. Also, numerical SIL design parameters were calculated by means of CODE V. Through the work, we propose the new type of SIL for high density optical recording systems.
Keywords
High Density Storage; Solid Immersion Lens; Total Internal Reflection; Near Field; Effective Numerical Aperture;
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