Image contrast in polarization microscopy of magneto-optical disk datastorage media through birefringent plastic substrates

Yung Chieh Hsieh, M. Mansuripur

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Using polarized-light microscopy, we have investigated the magnetic domains of perpendicularly magnetized media under several different conditions, including direct observation of the thin-film magnetic layer and observations through the glass or plastic substrates on which the magnetic film was deposited. The results show that the image contrast is reduced with an increasing numerical aperture of the objective lens. They also indicate that the polarization rotation caused by differences between the reflectivity-transmissivity of the p and s components of polarization deteriorate the magnetic image contrast. Furthermore, by comparing the image quality using the same objective lens on samples having different substrates, we found that the images obtained through plastic substrates are worse than those obtained through glass substrates. Birefringence of the plastic substrate is shown to be responsible for the additional degradation of the image contrast.

Original languageEnglish (US)
Pages (from-to)4839-4852
Number of pages14
JournalApplied optics
Volume36
Issue number20
DOIs
StatePublished - Jul 10 1997

Keywords

  • Magneto-optical data storage
  • Polarization microscopy
  • Substrate birefringence

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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