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Proceedings Paper

Herpin equivalents in magneto-optics: a magneto-optic layer sandwiched between two dielectric layers
Author(s): Vahram W. Biricik
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Paper Abstract

Magneto-optic elements are important in applications requiring frequency shifters. Certain applications require the incorporation of magneto-optic layers into a multilayer optical stack. This paper is concerned with the development of design methodology for maximizing magnetooptical effects. To aid in this developmental process, the well-known concept of thin film Herpin equivalent structures is extended into magneto-optics; specifically, the magneto- optical analog of Herpin equivalents is derived for a thin magneto-optic layer sandwiched between a symmetric pair of dielectric films. The magneto-optic configuration selected is that of the Transverse Kerr effect; that is, the magneto-optic layer magnetization lies in the plane of the film and is in a direction perpendicular to the plane of incidence. For this geometry, magneto-optic effects manifest themselves only for the p (in-plane) polarization. As part of the derivation process, reflectance and transmittance expressions are derived for a symmetric three-element film configuration. It is shown that the magneto-optic effects only manifest themselves in reflection; in other words, the transmitted electric field does not contain a magnetization dependent term. Additionally, as the direction of propagation of the light wave is reversed (with the electric field incident on the three layer structure from the back surface), the magneto-optic signal changes sign, indicating non-reciprocity of the coupling between the light waves and thin film magnetization. It is also shown that the magnitude of magneto-optic effects depends only on three terms: (a) the reduced magneto-optic coefficient of thin film material; (b) the phase thickness of the magneto-optic layer; and (c) the transmittance of the three layer structure.

Paper Details

Date Published: 1 December 1990
PDF: 15 pages
Proc. SPIE 1323, Optical Thin Films III: New Developments, (1 December 1990); doi: 10.1117/12.22392
Show Author Affiliations
Vahram W. Biricik, Northrop Research and Technolo (United States)

Published in SPIE Proceedings Vol. 1323:
Optical Thin Films III: New Developments
Richard Ian Seddon, Editor(s)

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