Influence of Injection Molding Process on the Local Fluctuations of Magneto-Optical Signals

The local fluctuations of magneto-optical (MO) signals were investigated in the vicinity of the preformat pits of polycarbonate (PC) substrates fabricated under different injection molding conditions and also using stampers which had different shapes of grooves and preformat pits. A strong correlati...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 40; no. 1R; p. 170
Main Authors Umezawa, Tomokazu, Horiguchi, Toru, Tomie, Takashi
Format Journal Article
LanguageEnglish
Published 01.01.2001
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Summary:The local fluctuations of magneto-optical (MO) signals were investigated in the vicinity of the preformat pits of polycarbonate (PC) substrates fabricated under different injection molding conditions and also using stampers which had different shapes of grooves and preformat pits. A strong correlation was observed between the substrate birefringence and the fluctuation of the MO signal. The rate-of-change of the fluctuations, as the phase shift of the optical head was varied, was attributed to the shapes of preformat pits and grooves. The fluctuation of the MO signal could be controlled by varying the injection molding conditions and the shapes of preformat pits and grooves.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.40.170