• 정보저장시스템학회:학술대회논문집
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• 2005.10a
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• pp.4-11
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• 2005

In this paper, we propose novel optics design for media inside near-field recording (NFR) using hemispherical solid immersion lens (HMS). To obtain strong advantage of data protection and high data capacity simultaneously, HMS based near field optics using aplanatic position of super hemisphere is designed. In this design, to improve small optical tolerance of this aplanatic position, additional aspheric lens surface is added on top of the HMS and it is combined with zoom optics which composed of two single lenses having low numerical aperture (NA). Also, to compensate chromatic aberration which happens seriously in optics using blue laser diode, diffractive optical element is used. Using zoom optics, additional aspheric lens surface, and diffractive optical element together, wavefront aberration and chromatic aberration are effectively reduced in broad range of cover layer thickness and wavelength variation. In addition, In this paper, effect of gap induced aberration is investigated by analyzing different behavior of each TM and TE wave for designed media inside dual-layer NFR optics.

• Transactions of the Society of Information Storage Systems
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• v.2 no.1
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• pp.13-20
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• 2006

In this paper, we propose novel optics design for media inside near-field recording(NFR) using hemispherical solid immersion lens(HMS). To obtain strong advantage of data protection and high data capacity simultaneously, HMS based near field optics using aplanatic position of super hemisphere is designed. In this design, to improve small optical tolerance of this aplanatic position, additional aspheric lens surface is added on top of the HMS and it is combined with zoom optics which composed of two single lenses having low numerical aperture(NA). Also, to compensate chromatic aberration which happens seriously in optics using blue laser diode, diffractive optical element is used. Using zoom optics, additional aspheric lens surface, and diffractive optical element together, wavefront aberration and chromatic aberration are effectively reduced in broad range of cover layer thickness and wavelength variation. In addition, in this paper, effect of gap induced aberration is investigated by analyzing different behavior of each TM and TE wave for designed media inside dual-layer NFR optics.

• 정보저장시스템학회:학술대회논문집
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• 2005.10a
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• pp.14-15
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• 2005

In near-field recording (NFR) optics using solid immersion lens (SIL), near-field air gap induces unwanted spherical aberration, defocus and astigmatism. This phenomenon can be explained with the apodization of phase and amplitude between each linearly polarized light. In this paper, we analyzed the effect of phase and amplitude apodization with the fundamental multiple beam interference theory, and we compared resultant diffracted patterns on the image plane for the Si-disk first surface media structure and cover-layer incident media structure.

• Korean Journal of Food Science and Technology
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• v.27 no.6
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• pp.1003-1007
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• 1995

The effect of brown rice extract on mitomycin C(MMC)-induced chromosome aberration was examined in cultured Chinese hamster lung(CHL) cells, after induction of chromosome aberration and mitotic index in CHL cells cultured with MMC were observed. There were no significant differences between mitotic indices of CHL cells treated with DMSO, and MMC and brown rice extract. The frequency of chromosome aberration showed dose-dependent relationship in CHL cells treated with $0.2{\sim}3.0\;{\mu}g$/assay of MMC. But chromosome aberrations could not be assayed Our to cytotoxicity of MMC when its concentrations were above $3.0\;{\mu}g$/assay. Chromatid type, especially gap and break, of chromosome aberration were most frequently observed. When CHL cells treated with $2.0\;{\mu}g$/assay of MMC and brown rice extracts of concentration ranging $0.75{\sim}10.0\;{\mu}g$/assay were incubated, frequencies of chromosome aberration induced by MMC were significantly decreased at above concentrations(p<0.01, p<0.05). As concentration of brown rice extract was increased, frequencies of chromosome aberration was decreased $7{\sim}30%$, in some irregularity.