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Quasi-optics of a thin-film polarization converter

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Abstract

A planar thin isotropic film sandwiched between an isotropic cover and an electro-optic substrate crystal can support transverse electric and transverse magnetic guided modes. When an external electric field is applied to the substrate and is harmonically modulated suitably in the propagation direction, the two modes have a phase-matched interaction and exchange energy in the propagation direction. The governing equations of this interaction are deduced, using a quasi-optical technique for two orientations of the substrate crystal, and are analyzed to yield the requirement for the complete polarization conversion. Representative numerical results are obtained to show that for practically realizable film thicknesses, complete polarization conversion can be achieved in acceptable values of the interaction length and with acceptable frequency selectivity.

© 1989 Optical Society of America

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