Abstract

The maximum infrared absorption that can be obtained in an unsupported metal film in air is 50 percent. It is shown that the absorption may be increased by supporting the metal on a dielectric of high refractive index, provided that the radiation passes through the dielectric to the metal. Under certain conditions there is then no reflection from the layer. If the combination is reversed so that the radiation is incident on the metal first, a low absorption results. If the supporting dielectric is of low refractive index neither direction will lead to high absorption; in this case the use of another system, with metal on each side of the support is preferable. Using whichever of the two systems is appropriate to the supporting dielectric, an absorption of 70 percent is always obtainable.

© 1954 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Measuring the infrared absorption in thin film coatings

James A. Harrington, Morris Braunstein, and J. Earl Rudisill
Appl. Opt. 16(11) 2843-2846 (1977)

Ellipsometer Study of Anomalous Absorption in Very Thin Dielectric Films on Evaporated Metals*

N. M. Bashara and D. W. Peterson
J. Opt. Soc. Am. 56(10) 1320-1331 (1966)

Infrared Absorption of Thin Metal Films at Non-Normal Incidence

C. Hilsum
J. Opt. Soc. Am. 45(2) 135-136 (1955)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (7)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (31)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription