Scientific Results

Investigation of electric internal field in congruent LiNbO3 by electro-optic effect

Year: 2004

Authors: Paturzo M., Alfieri D., Grilli S., Ferraro P., De Natale P., De Angelis M., De Nicola S., Finizio A., Pierattini G.

Autors Affiliation: Istituto Nazionale di Ottica Applicata, Sez. di Napoli, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy;
Istituto di Cibernetica del CNR, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy

Abstract: We investigate the effect of the defect-induced internal field on the electro-optic behavior of z-cut congruent lithium niobate crystals. We measure, by a spatially resolved interferometric technique, the phase retardation due to an external applied voltage occurring in two regions with opposite ferroelectric polarization. When measurements are performed just after electrical poling, the two opposite domains show a different electro-optic behavior. We interpret this as due to an elastic component of the internal field. In fact, the asymmetric behavior disappears when the sample is thermally annealed, i.e., when the internal field vanishes. (C) 2004 American Institute of Physics.

Journal/Review: APPLIED PHYSICS LETTERS

Volume: 85 (23)      Pages from: 5652  to: 5654

KeyWords: Annealing; Crystalline materials; Electric field effects; Electrooptical effects; Ferroelectricity; Holograms; Interferometry; Optical materials; Refractive index; Tensors, Electrical poling; Ferroelectric polarization; Hysteresis loops; Phase retardation, Lithium niobate
DOI: 10.1063/1.1832738

Citations: 20
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