Ellipsometric measurement of skin refractive index in vivo

  • P. T. Pugliese
  • A. J. Milligan
Chapter

Summary

This technique measures two angles (ψ and ∆) of a light beam, and the changes in these angles because of the surface reflection. ψ is a trigometric ratio function of the parallel and perpendicular beam amplitudes (relative to the plane of incidence). ∆ is the related phase shift between these two orthogonal beam components. After the beam strikes a surface these two values change according to the electrical properties of the material. Measurement of these two parameters can be accomplished by various techniques and in this investigation measurement was performed using phase-modulated ellipsometry. These two values can be used to determine the real and imaginary components of the refractive index which in turn describes both the light-bending and lightabsorption properties of the medium. With continued experimentation this instrument will enable non-invasive detailed exploration to be made of skin thickness, changes due to sun damage, and effectiveness of various cosmetic preparations.

Keywords

Hydrated Beach Refraction Dermatol 

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References

  1. 1.
    Barer, R. and Joseph, S. (1954). Refractometry of living cells. J. Microscopical Sci., 95, 399Google Scholar
  2. 2.
    Needham, G. H. (1977). The Practical Use of the Microscope Including Photomicrography, p, 204. (Springfield: Charles C. Thomas)Google Scholar
  3. 3.
    Scheuplein, R. J. (1964). A survey of some fundamental aspects of the absorption and reflection of light by tissue. J. Soc. Cosmetic Chem., 15, 111Google Scholar
  4. 4.
    Aspnes, D. E. (1976). Spectroscopic ellipsometry of solids. In Seraphin, B. O. (ed.) Optical Properties of Solid: New Developments, pp. 801–842. (Amsterdam: North-Holland)Google Scholar
  5. 5.
    Clark, D. and Grainger, J. E. (1971). Polarized Light and Optical Measurement. (Oxford: Pergamon Press)Google Scholar
  6. 6.
    Jenkins, F. A. and White, H. E. (1976). Fundamentals of Optics, 4th ed. (New York: McGraw Hill)Google Scholar
  7. 7.
    Born, M. and Wolf,, E. (1975). Principle of Optics. (Oxford: Pergamon Press)Google Scholar
  8. 8.
    Muller, R. H. (1976). Present status of automatic ellipsometers. Surface Sci., 56, 19CrossRefGoogle Scholar
  9. 9.
    Malin, M. and Vefam, K. (1976). Generalized ellipsometric method for the determination of all the optical constants of a system. Surface Sci., 56, 49CrossRefGoogle Scholar
  10. 10.
    Jasperson, S. N. and Schatterly, S. E. (1969). An improved method for high reflectivity ellipsometry based on a new polarization modulation technique. Rev. Sci. Inst., 40, 761CrossRefGoogle Scholar
  11. 11.
    Jasperson, S. N. (1973). A modulated ellipsometer for studying the film optical properties and surface dynamics. Surface Sci.. 37, 548CrossRefGoogle Scholar
  12. 12.
    Muller, R. H. (1969). Definition and convention in ellipsometry. Surface Sci., 16, 14CrossRefGoogle Scholar
  13. 13.
    Van Duzee. B. (1978). The influence of water content, chemical treatment and temperature on the biological properties of stratum corneum. J. Invest. Dermatol., 71, 140PubMedCrossRefGoogle Scholar
  14. 14.
    Kligman, A. L. (1979). Perspectives and problems in cutaneous gerontology. J. Invest. Dermatol.. 73, 39PubMedCrossRefGoogle Scholar
  15. 15.
    Lariker, R. M. (1979). Structural alterations in exposed and unexposed aged skin. J. Invest. Dermatol.. 73, 59CrossRefGoogle Scholar

Copyright information

© MTP Press Limited 1981

Authors and Affiliations

  • P. T. Pugliese
  • A. J. Milligan

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