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39 - Polarization microscopy

Published online by Cambridge University Press:  31 January 2011

Masud Mansuripur
Affiliation:
University of Arizona
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Summary

The state of polarization of a given beam of light is modified upon reflection from (or transmission through) an object. The resulting change in polarization state conveys information about the structure and certain physical properties of the illuminated region. Polarization microscopy is a variant of conventional optical microscopy that enables one to monitor these changes over a small area of a specimen. Such observations then allow the user to identify and analyze the specimen's structural and other physical features.

Traditionally, observations with a polarization microscope have been categorized “orthoscopic” or “conoscopic.” orthoscopic observations involve direct imaging of the sample itself, thus allowing one to view the indentations, striations, variations of optical activity and birefringence, etc., over the sample's surface. conoscopic observations, however, involve illuminating a crystalline surface with a cone of light and then imaging the exit pupil of the objective lens. This mode of observation is used in characterizing the crystal's ellipsoid of birefringence and identifying its optical axes.

The polarization microscope

Figure 39.1 is a simplified diagram of a polarization microscope. The light source is typically an extended white light source, such as a halogen lamp or an arc lamp. The collected and collimated beam from the source is linearly polarized as a result of passage through a polarizer. In metallurgical microscopes, such as the one shown here, the objective lens is used both for illuminating the sample and for collecting the reflected light.

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Publisher: Cambridge University Press
Print publication year: 2009

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References

Inoué, S. and Oldenbourg, R., Microscopes, in Handbook of Optics, Vol. II, second edition, McGraw-Hill, New York, 1995.Google Scholar
Benford, J. R. and Rosenberger, H. E., Microscopes, in Applied Optics and Optical Engineering, Vol. IV, ed. Kingslake, R., Academic Press, New York, 1967.Google Scholar
Born, M. and Wolf, E., Principles of Optics, 6th edition, Pergamon Press, Oxford, 1980.Google Scholar
Kubota, H. and Inoué, S., Diffraction images in the polarizing microscope, J. Opt. Soc. Am. 49, 191–198 (1959).CrossRefGoogle ScholarPubMed
Hsieh, Y. C. and Mansuripur, M., image contrast in polarization microscopy of magneto-optical disk data-storage media through birefringent plastic substrates, Applied Optics 36, 4839–4852 (1997).CrossRefGoogle ScholarPubMed
Benford, J. R., microscope objectives, in Applied Optics and Optical Engineering, Vol. III, ed. Kingslake, R., Academic Press, New York, 1965.Google Scholar

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  • Polarization microscopy
  • Masud Mansuripur, University of Arizona
  • Book: Classical Optics and its Applications
  • Online publication: 31 January 2011
  • Chapter DOI: https://doi.org/10.1017/CBO9780511803796.042
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  • Polarization microscopy
  • Masud Mansuripur, University of Arizona
  • Book: Classical Optics and its Applications
  • Online publication: 31 January 2011
  • Chapter DOI: https://doi.org/10.1017/CBO9780511803796.042
Available formats
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  • Polarization microscopy
  • Masud Mansuripur, University of Arizona
  • Book: Classical Optics and its Applications
  • Online publication: 31 January 2011
  • Chapter DOI: https://doi.org/10.1017/CBO9780511803796.042
Available formats
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