Abstract

Dipolar clusters are crucial structure factors in electro-optic (EO) effects. Here, the impacts of dipolar clusters on EO effects are investigated in ${\mathrm{KTa}}_{1-x}{\mathrm{Nb}}_x{\mathrm{O}}_3$ using electric-field-dependent EO characteristics. The results indicate that the field-driven reorientation of dipolar clusters determines the orientational electric susceptibility, deeply contributing to the excellent quadratic EO effects. The controlled average size of correlated local dipoles and uniform orientation of ferroelectric domains efficiently suppress light scattering, being beneficial for the modulation of incident light. The understanding of dipolar cluster-triggered EO responses is valuable for exploring origins of large EO effects and optimizing EO properties of materials.

© 2018 Optical Society of America

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