We investigated the electro-optic (EO) response of a reflective planar microcavity with a poled polymer spacer using reflection ellipsometry. We designed and fabricated the microcavity to have an enhanced local field in the EO polymer spacer and evaluated the resulting enhancement in the voltage-induced phase difference between the s-and p-polarized components. The phase difference obtained was 56 times larger than that for the EO polymer alone. This enhancement is attributed to the polarization-dependent local field effect for oblique incidence.
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