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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 44, Iss. 5 — May. 1, 1954
  • pp: 357–362

The Optical Constants of Silver, Gold, Copper, and Aluminum. I. The Absorption Coefficient k

L. G. SCHULZ  »View Author Affiliations


JOSA, Vol. 44, Issue 5, pp. 357-362 (1954)
http://dx.doi.org/10.1364/JOSA.44.000357


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Abstract

A description is given of a comparison method for determining the values of the absorption coefficient k of a metal relative to previously determined values for Ag. In this method transmission interference filters are constructed which have mica as the dielectric and have reflecting layers of Ag and of the metal x being studied. On adjacent areas of a single sheet of mica, pairs of filters are formed, one with a Ag-mica-Ag combination and the other with a Ag-mica-x combination. Components of a filter pair will have identical mica thicknesses. For a given filter pair the wavelengths transmitted by one combination are compared with those transmitted by the other. Values of k are then calculated from the change in phase accompanying the reflection of light at normal incidence at mica-metal interfaces. The method was found to have special advantages in the wavelength region of 0.65µ to 0.95µ for metals with high reflectivities. Results are given for Au, Cu, and Al in the range of 0.45µ to 0.95µ. The new values of k tend to be higher than older values obtained by other methods. A discussion is included concerning the validity of surface measurements for determining the bulk properties of metals.

Citation
L. G. SCHULZ, "The Optical Constants of Silver, Gold, Copper, and Aluminum. I. The Absorption Coefficient k," J. Opt. Soc. Am. 44, 357-362 (1954)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-44-5-357


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References

  1. L. G. Schulz, J. Opt. Soc. Am. 41, 1047 (1951).
  2. L. G. Schulz and E. J. Scheibner, J. Opt. Soc. Am. 40, 761 (1950).
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  5. Handbuch der Physik (Verlag Julius Springer, Berlin, 1928), Vol. 20. Chap. 6.
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  24. To be given later.

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